[TUTORIAL] Set Trainer's Pokémon's Levels dynamically

Diego Mertens · Dec 5, 2019

And after a lot of try and error, I finally managed to get this thing working.
The features that this presents are simple;

Trainer Pokémon's level are 2 levels less, 2 more and everything in-between if you're overleveled
takes the average of yout level by adding the level of all the pokemon in your party and dividing it by the amount of pokemon in your party, taking into consideration the highest level in your team, and its difference with the lowest to make less probable that people can take advantage of this to win
if its a decimal number, its rounded down
if the results gives 2 or 1, it changes the result for 3, because if not, when it makes the rest, it gives zero or minus one

how to implement it?
just go to src/battle_main.c and inside of CreateNPCTrainerParty, define this: (thanks to DdraigZek and WiserVisor for upgrading a little bit my code and adding some cool features!)

Code:

u16 dynamicLevel = 0;
	
// This is used to hold the level's of the player's strongest[1] and weakest[0] Pokemon
u8 LevelSpread[] = {0, 0};
	
// This will be used when assigning the level of the opponent's Pokemon
u16 PartyLevelAdjust;
    
    // Change stuff like this to get the levels you want
    static const u8 minDynamicLevel = 3;
    static const u8 maxDynamicLevel = 98;

    // Calculates Average of your party's levels
    for(i = 0; i < PARTY_SIZE; i++)
    {
        if(GetMonData(&gPlayerParty[i], MON_DATA_SPECIES) == SPECIES_NONE)
        {
            if(i != 0)
		dynamicLevel /= i;
            break;
        }
        dynamicLevel += GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	if(i == 0)
	{
	    LevelSpread[0], LevelSpread[1] = GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	}
	else
	{
	    u8 LevelCheck = GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	    if(LevelCheck < LevelSpread[0])
	        LevelSpread[0] = LevelCheck;
	    else if(LevelCheck > LevelSpread[1])
		LevelSpread[1] = LevelCheck;
	}
    }
    if(i == PARTY_SIZE)
		dynamicLevel /= i;
/* The following is used to account for a player having one or two very weak Pokemon
	   along with some very strong Pokemon. It weights the averaged level more towards the
	   player's strongest Pokemon
	*/
	
	PartyLevelAdjust = LevelSpread[1] - LevelSpread[0];
	
	if(LevelSpread[1] - dynamicLevel < 10)
	{
		PartyLevelAdjust = 0;
	}
	else if(LevelSpread[1] - dynamicLevel < 20)
	{
		PartyLevelAdjust /= 10;
	}
	else if(LevelSpread[1] - dynamicLevel < 30)
	{
		PartyLevelAdjust /= 5;
	}
	else if(LevelSpread[1] - dynamicLevel < 40)
	{
		PartyLevelAdjust *= 3;
		PartyLevelAdjust /= 10;
	}
	else if(LevelSpread[1] - dynamicLevel < 50)
	{
		PartyLevelAdjust *= 2;
		PartyLevelAdjust /= 5;
	}
	else if(LevelSpread[1] - dynamicLevel < 60)
	{
		PartyLevelAdjust /= 2;
	}
	else if(LevelSpread[1] - dynamicLevel < 70)
	{
		PartyLevelAdjust *= 3;
		PartyLevelAdjust /= 5;
	}
	else if(LevelSpread[1] - dynamicLevel < 80)
	{
		PartyLevelAdjust *= 7;
		PartyLevelAdjust /= 10;
	}
	else if(LevelSpread[1] - dynamicLevel < 90)
	{
		PartyLevelAdjust *= 4;
		PartyLevelAdjust /= 5;
	}
    //Handling values to be always be in the range,
    // ( minDynamiclevel-levelDifference , maxDynamiclevel+levelDifference )
    if(dynamicLevel < minDynamicLevel) dynamicLevel = minDynamicLevel;
    else if(dynamicLevel > maxDynamicLevel) dynamicLevel = maxDynamicLevel;

After that, search "for (i = 0; i < monsCount; i++)
{" and just below that, add this:

Code:

			int rand_diff = Random() % 5;
			switch(rand_diff)
			{
				case 0:
					rand_diff = 2;
					break;
				case 1:
					rand_diff = 1;
					break;
				case 2:
					rand_diff = 0;
					break;
				case 3:
					rand_diff = -1;
					break;
				case 4:
					rand_diff = -2;
			}

And, above "gBattleTypeFlags |= gTrainers[trainerNum].doubleBattle;", paste this " dynamicLevel -= rand_diff + PartyLevelAdjust;"
It should look like this: (thanks, vxo)

vxo said:

Now, search "CreateMon(&party, partyData.species" and replace the whole line with this:

Code:

if (partyData[i].lvl >= dynamicLevel) CreateMon(&party[i], partyData[i].species, partyData[i].lvl, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0); else CreateMon(&party[i], partyData[i].species, dynamicLevel, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);

This'll make the changes only appear when your team is overleveled, so you'll still have to grind a little and stuff
Evolution feature! (thanks to WiserVisor )

Spoiler:

add this below "static void HandleAction_ActionFinished(void);":

Code:

u16 HasLevelEvolution(u16 species, u8 level);

I just added the last function definition at the end of this list.

Then, at each instance of
[/code]
if (partyData.lvl >= dynamicLevel)
CreateMon(&party, partyData.species, partyData.lvl, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);
else
CreateMon(&party, partyData.species, dynamicLevel - levelDifference, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);
[/code]
You replace it with this:

Code:

if (partyData[i].lvl >= dynamicLevel) CreateMon(&party[i], partyData[i].species, partyData[i].lvl, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0); else { if(HasLevelEvolution(partyData[i].species, dynamicLevel)) CreateMon(&party[i], HasLevelEvolution(partyData[i].species, dynamicLevel), dynamicLevel, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0); else CreateMon(&party[i], partyData[i].species, dynamicLevel, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0); }

Finally, add this to the end:

Code:

u16 HasLevelEvolution(u16 species, u8 level) { if(gEvolutionTable[species][0].param && gEvolutionTable[species][0].param <= level) { if(HasLevelEvolution(gEvolutionTable[species][0].targetSpecies, level)) return HasLevelEvolution(gEvolutionTable[species][0].targetSpecies, level); else return gEvolutionTable[species][0].targetSpecies; } return 0; }

This function checks to see if the Pokemon, at the given level, will evolve. It will also check if it can evolve a second time at the given level. It returns the proper species value if it can evolve, or it returns 0 if it can't.

Hope you enjoy this!

DdraigZek · Mar 30, 2020

Diego Mertens said:
And after a lot of try and error, I finally managed to get this thing working.
The features that this presents are simple;

Trainer Pokémon's level are -2, equal and +2 levels in comparison to yours depending if they have custom items, moves, both or none. -2 for none, equal for just items or just moves, and +2 if it has both of them

takes the average of yout level by adding the level of all the pokemon in your party and dividing it by the amount of pokemon in your party.

if its a decimal number, its rounded down

if the results gives 2 or 1, it changes the result for 3, because if not, when it makes the rest, it gives zero or minus one

how to implement it?
just go to src/battle_main.c and inside of CreateNPCTrainerParty, define this:

Code:

u8 fixedLVL = 0; { if (GetMonData(&gPlayerParty[5], MON_DATA_SPECIES) != SPECIES_NONE) fixedLVL = (GetMonData(&gPlayerParty[0], MON_DATA_LEVEL) + GetMonData(&gPlayerParty[1], MON_DATA_LEVEL) + GetMonData(&gPlayerParty[2], MON_DATA_LEVEL) + GetMonData(&gPlayerParty[3], MON_DATA_LEVEL) + GetMonData(&gPlayerParty[4], MON_DATA_LEVEL) + GetMonData(&gPlayerParty[5], MON_DATA_LEVEL)) / 6; if (fixedLVL <= 2) fixedLVL = 3; else if ((GetMonData(&gPlayerParty[5], MON_DATA_SPECIES) == SPECIES_NONE) && (GetMonData(&gPlayerParty[4], MON_DATA_SPECIES) != SPECIES_NONE)) fixedLVL = (GetMonData(&gPlayerParty[0], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[1], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[2], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[3], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[4], MON_DATA_LEVEL)) / 5; if (fixedLVL <= 2) fixedLVL = 3; else if ((GetMonData(&gPlayerParty[4], MON_DATA_SPECIES) == SPECIES_NONE) && (GetMonData(&gPlayerParty[3], MON_DATA_SPECIES) != SPECIES_NONE)) fixedLVL = (GetMonData(&gPlayerParty[0], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[1], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[2], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[3], MON_DATA_LEVEL)) / 4; if (fixedLVL <= 2) fixedLVL = 3; else if ((GetMonData(&gPlayerParty[3], MON_DATA_SPECIES) == SPECIES_NONE) && (GetMonData(&gPlayerParty[2], MON_DATA_SPECIES) != SPECIES_NONE)) fixedLVL = (GetMonData(&gPlayerParty[0], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[1], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[2], MON_DATA_LEVEL)) / 3; if (fixedLVL <= 2) fixedLVL = 3; else if ((GetMonData(&gPlayerParty[2], MON_DATA_SPECIES) == SPECIES_NONE) && (GetMonData(&gPlayerParty[1], MON_DATA_SPECIES) != SPECIES_NONE)) fixedLVL = (GetMonData(&gPlayerParty[0], MON_DATA_LEVEL)+GetMonData(&gPlayerParty[1], MON_DATA_LEVEL)) / 2; if (fixedLVL <= 2) fixedLVL = 3; else if ((GetMonData(&gPlayerParty[1], MON_DATA_SPECIES) == SPECIES_NONE) && (GetMonData(&gPlayerParty[0], MON_DATA_SPECIES) != SPECIES_NONE)) fixedLVL = GetMonData(&gPlayerParty[0], MON_DATA_LEVEL); if (fixedLVL <= 2) fixedLVL = 3; }

Now, search "CreateMon(&party, partyData.species" and replace the whole line with this:

Code:

CreateMon(&party[i], partyData[i].species, fixedLVL, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);

now, in the first change the " fixedLVL" for a " (fixedLVL)-2"
and in the last one, change the " fixedLVL" for a " (fixedLVL)+2"
this is just for making normal battles easy as always and rival/gym/elite 4 battles harder by making them having lower/higher levels than you.
Hope you enjoy this!

Hey Diego Mertens,
I am new to romhacking scene and I found this guide of yours. I am posting this updated version of code your code as I found that the code has no checks for a party whoose average level is 100 and it also allows someone to challenge e4 where e4's average level is like 7.

In src/battle_main.c find function CreateNPCTrainerParty, post the following code after all the variable declarations.

Code:

/* Dynamic values are always in range (1,100) They will only be used if the normal level of opponent's mons is less than the average user level. Opponents who have both custom moves AND held items will have dynamic range (5,100) otherwise the opponents will have dynamic range (1,96) */ u16 dynamicLevel = 0; // Change stuff like this to get the levels you want static const u8 minDynamicLevel = 3; static const u8 maxDynamicLevel = 98; static const u8 levelDifference = 2; // Calculates Average of your party's levels for(i = 0; i < PARTY_SIZE; i++) { if(GetMonData(&gPlayerParty[i], MON_DATA_SPECIES) == SPECIES_NONE) { if(i != 0) dynamicLevel /= i; break; } dynamicLevel += GetMonData(&gPlayerParty[i], MON_DATA_LEVEL); } if(i == PARTY_SIZE) dynamicLevel /= i; //Handling values to be always be in the range, // ( minDynamiclevel-levelDifference , maxDynamiclevel+levelDifference ) if(dynamicLevel < minDynamicLevel) dynamicLevel = minDynamicLevel; else if(dynamicLevel > maxDynamicLevel) dynamicLevel = maxDynamicLevel;

The above code is an elegant way to handle finding the level average and making sure the levels never get outside the range 1 to 100.

I have used u16 to store the average instead of u8 as if the party is 6 lvl 100 mons then the u8 will overflow during average calculation.

Then replace the 4 occurences of this line in switch case block,

Code:

CreateMon(&party[i], partyData[i].species, partyData[i].lvl, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);

with,

Code:

if (partyData[i].lvl >= dynamicLevel) CreateMon(&party[i], partyData[i].species, partyData[i].lvl, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0); else CreateMon(&party[i], partyData[i].species, dynamicLevel - levelDifference, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);

This code ensures that the dynamic levels are only used if the user is overleveled. Use dynamicLevel + levelDifference in last case.

The three constants minDynamicLevel, maxDynamicLevel and levelDifference are used to define the change in levels. Change them or remove "static const" and use random values to spice up stuff a bit.

--------------------------------------------------

I would also like to give more ideas to make this level generation cooler!
- Evolve opponent's mons if the level is too high or something
- Make the average weighted, so the system cannot be abuse by having a super low level pokemon in party (or somehow take into amount the max level of the party)
- Make the levels more dynamic based on the opponent's class or the area so there is still a sense of progression.

--------------------------------------------------

Offtopic but I would also like to ask two other things,
1) how to mention people on this forum.
2) Is there any constants or lists that define which pokemon evolves to which in decomp so I can use it in this code to get opponents pokemon to evolve too?

Thanks,
DdraigZek.

WiserVisor · May 25, 2020

DdraigZek said:
2) Is there any constants or lists that define which pokemon evolves to which in decomp so I can use it in this code to get opponents pokemon to evolve too?

As a matter of fact, there is. I've already written up the code to do this, as well as a few other things.

For the evolving, you're going to need this:

Spoiler:

Code:

static void HandleAction_SafariZoneRun(void);
static void HandleAction_WallyBallThrow(void);
static void HandleAction_TryFinish(void);
static void HandleAction_NothingIsFainted(void);
static void HandleAction_ActionFinished(void);
u16 HasLevelEvolution(u16 species, u8 level);

I just added the last function definition at the end of this list.

Then, at each instance of

Code:

if (partyData[i].lvl >= dynamicLevel)
    CreateMon(&party[i], partyData[i].species, partyData[i].lvl, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);
else
    CreateMon(&party[i], partyData[i].species, dynamicLevel - levelDifference, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);

You replace it with this:

Code:

if (partyData[i].lvl >= dynamicLevel)
    CreateMon(&party[i], partyData[i].species, partyData[i].lvl, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);
else
{
    if(HasLevelEvolution(partyData[i].species, dynamicLevel))
	CreateMon(&party[i], HasLevelEvolution(partyData[i].species, dynamicLevel), dynamicLevel, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);
    else
	CreateMon(&party[i], partyData[i].species, dynamicLevel, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);
}

This checks to see if the Pokemon, at its new level, would evolve. If so, it changes the species to its evolved form. If not, it stays the same species. You may notice that I changed

Code:

dynamicLevel - levelDifference

to just

Code:

dynamicLevel

I'll explain why later on.

Finally, add this to the end:

Code:

u16 HasLevelEvolution(u16 species, u8 level)
{
	if(gEvolutionTable[species][0].param && gEvolutionTable[species][0].param <= level)
	{
		if(HasLevelEvolution(gEvolutionTable[species][0].targetSpecies, level))
			return HasLevelEvolution(gEvolutionTable[species][0].targetSpecies, level);
		else
			return gEvolutionTable[species][0].targetSpecies;
	}
	return 0;
}

This function checks to see if the Pokemon, at the given level, will evolve. It will also check if it can evolve a second time at the given level. It returns the proper species value if it can evolve, or it returns 0 if it can't.

I've also made another change to this code. I noticed that, theoretically, a player could try to manipulate the dynamicLevel by having one really strong Pokemon on their team, and then a bunch of weak ones, thus skewing the average to be much lower. I came up with a process that makes this tactic not work, or at least not work nearly as well.

Spoiler:

Change this:

Code:

u16 dynamicLevel = 0;
    
// Change stuff like this to get the levels you want
static const u8 minDynamicLevel = 3;
static const u8 maxDynamicLevel = 98;
static const u8 levelDifference = 2;

    // Calculates Average of your party's levels
    for(i = 0; i < PARTY_SIZE; i++)
    {
        if(GetMonData(&gPlayerParty[i], MON_DATA_SPECIES) == SPECIES_NONE)
        {
            if(i != 0) dynamicLevel /= i;
            break;
        }
        dynamicLevel += GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
    }
    if(i == PARTY_SIZE) dynamicLevel /= i;

To this:

Code:

u16 dynamicLevel = 0;
	
// This is used to hold the level's of the player's strongest[1] and weakest[0] Pokemon
u8 LevelSpread[] = {0, 0};
	
// This will be used when assigning the level of the opponent's Pokemon
u16 PartyLevelAdjust;
    
    // Change stuff like this to get the levels you want
    static const u8 minDynamicLevel = 3;
    static const u8 maxDynamicLevel = 98;

    // Calculates Average of your party's levels
    for(i = 0; i < PARTY_SIZE; i++)
    {
        if(GetMonData(&gPlayerParty[i], MON_DATA_SPECIES) == SPECIES_NONE)
        {
            if(i != 0)
		dynamicLevel /= i;
            break;
        }
        dynamicLevel += GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	if(i == 0)
	{
	    LevelSpread[0], LevelSpread[1] = GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	}
	else
	{
	    u8 LevelCheck = GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	    if(LevelCheck < LevelSpread[0])
	        LevelSpread[0] = LevelCheck;
	    else if(LevelCheck > LevelSpread[1])
		LevelSpread[1] = LevelCheck;
	}
    }
    if(i == PARTY_SIZE)
		dynamicLevel /= i;

I'll break down what this all does.

Code:

u8 LevelSpread[]

and

Code:

u16 PartyLevelAdjust

are used to account for a team with a widely spread level average. LevelSpread holds the highest and lowest levels, and PartyLevelAdjust will end up holding the value that will be added to dynamicLevel later. You may also notice that I deleted

Code:

levelDifference

This is because it is made useless by some other code that I wrote further down in the post.

Code:

if(i == 0)
	{
	    LevelSpread[0], LevelSpread[1] = GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	}
	else
	{
	    u8 LevelCheck = GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	    if(LevelCheck < LevelSpread[0])
	        LevelSpread[0] = LevelCheck;
	    else if(LevelCheck > LevelSpread[1])
		LevelSpread[1] = LevelCheck;
	}

This bit of code handles finding the highest and lowest levels in the player's team. It sets the level of the player's first Pokemon as both the highest and lowest value, and then compares each subsequent Pokemon's level, seeing if it's greater than the current highest level or lower than the current lowest level. By the end of it, LevelSpread will have the lowest level at index 0, and the highest level at index 1.

In-between

Code:

if(i == PARTY_SIZE)
		dynamicLevel /= i;

And

Code:

//Handling values to be always be in the range,
    // ( minDynamiclevel-levelDifference , maxDynamiclevel+levelDifference )
    if(dynamicLevel < minDynamicLevel) dynamicLevel = minDynamicLevel;
    else if(dynamicLevel > maxDynamicLevel) dynamicLevel = maxDynamicLevel;

Add this code in:

Code:

/* The following is used to account for a player having one or two very weak Pokemon
	   along with some very strong Pokemon. It weights the averaged level more towards the
	   player's strongest Pokemon
	*/
	
	PartyLevelAdjust = LevelSpread[1] - LevelSpread[0];
	
	if(LevelSpread[1] - dynamicLevel < 10)
	{
		PartyLevelAdjust = 0;
	}
	else if(LevelSpread[1] - dynamicLevel < 20)
	{
		PartyLevelAdjust /= 10;
	}
	else if(LevelSpread[1] - dynamicLevel < 30)
	{
		PartyLevelAdjust /= 5;
	}
	else if(LevelSpread[1] - dynamicLevel < 40)
	{
		PartyLevelAdjust *= 3;
		PartyLevelAdjust /= 10;
	}
	else if(LevelSpread[1] - dynamicLevel < 50)
	{
		PartyLevelAdjust *= 2;
		PartyLevelAdjust /= 5;
	}
	else if(LevelSpread[1] - dynamicLevel < 60)
	{
		PartyLevelAdjust /= 2;
	}
	else if(LevelSpread[1] - dynamicLevel < 70)
	{
		PartyLevelAdjust *= 3;
		PartyLevelAdjust /= 5;
	}
	else if(LevelSpread[1] - dynamicLevel < 80)
	{
		PartyLevelAdjust *= 7;
		PartyLevelAdjust /= 10;
	}
	else if(LevelSpread[1] - dynamicLevel < 90)
	{
		PartyLevelAdjust *= 4;
		PartyLevelAdjust /= 5;
	}

What this code does is it first finds the difference between the highest and lowest level of the player's team. It then compares the highest level of the player's team with the average of the player's team. Depending on how much greater the highest level is from the average, PartyLevelAdjust will be changed accordingly. If the difference between the highest level and the average is small, PartyLevelAdjust will get notably smaller. If the difference is big, PartyLevelAdjust won't decrease all that much.

Next, right after

Code:

for (i = 0; i < monsCount; i++)
{

Add this:

Code:

int rand_diff = Random() % 5;
switch(rand_diff)
{
	case 0:
		rand_diff = 2;
		break;
	case 1:
		rand_diff = 1;
		break;
	case 2:
		rand_diff = 0;
		break;
	case 3:
		rand_diff = -1;
		break;
	case 4:
		rand_diff = -2;
}
			
dynamicLevel += rand_diff + PartyLevelAdjust;

This code adds a little bit of randomness by changing the average level ever-so slightly. It could go up by 2, down by 2, or anywhere in-between. The last line is the culmination of it all, where dynamicLevel is increased by both rand_diff (the random level change) and PartyLevelAdjust (the accounting for the extreme level spread). With this, dynamicLevel has both a touch of randomness and an adjustment for any tricky trainers trying to bend the system. This is also why I changed

Code:

dynamicLevel - levelDifference

to just

Code:

dynamicLevel

dynamicLevel is already set properly, so there's no need to have levelDifference around anymore.

At the end of the for-loop, add this:

Code:

dynamicLevel -= rand_diff + PartyLevelAdjust;

This makes sure that dynamicLevel doesn't keep increasing forever, but instead goes back down to just the average for each Pokemon. That way, each Pokemon on the opponent's team can have their own random level adjustment. If you're unsure where the for-loop ends, put it here:

Code:

case F_TRAINER_PARTY_CUSTOM_MOVESET | F_TRAINER_PARTY_HELD_ITEM:
{
     const struct TrainerMonItemCustomMoves *partyData = gTrainers[trainerNum].party.ItemCustomMoves;

     for (j = 0; gSpeciesNames[partyData[i].species][j] != EOS; j++)
          nameHash += gSpeciesNames[partyData[i].species][j];

      personalityValue += nameHash << 8;
      fixedIV = partyData[i].iv * 31 / 255;
      if (partyData[i].lvl >= dynamicLevel)
          CreateMon(&party[i], partyData[i].species, partyData[i].lvl, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);
      else
	{
	       if(HasLevelEvolution(partyData[i].species, dynamicLevel))
	            CreateMon(&party[i], HasLevelEvolution(partyData[i].species, dynamicLevel), dynamicLevel, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);
               else
		    CreateMon(&party[i], partyData[i].species, dynamicLevel, fixedIV, TRUE, personalityValue, OT_ID_RANDOM_NO_SHINY, 0);
        }

        SetMonData(&party[i], MON_DATA_HELD_ITEM, &partyData[i].heldItem);

        for (j = 0; j < MAX_MON_MOVES; j++)
        {
             SetMonData(&party[i], MON_DATA_MOVE1 + j, &partyData[i].moves[j]);
             SetMonData(&party[i], MON_DATA_PP1 + j, &gBattleMoves[partyData[i].moves[j]].pp);
        }
        break;
}
}
dynamicLevel -= rand_diff + PartyLevelAdjust;

The adjusting for the extreme party level spread is still a little imperfect. It works very well if the player has a ridiculous level spread, like a lvl 100 with a few lvl 5 Pokemon, but when the difference is a smaller but still causes some problems with the party average, it only increases the average by 1 or 2 levels, which is not enough to make the battle a challenge. I'll keep messing around with it until I get something that increases the challenge a bit more, but not to the point where the battle is impossible.

And that should just about do it! Hopefully I didn't miss anything. If you have any errors with this code, just let me know, and I'll try to help you out.

connormon1 · Jul 1, 2020

hey, is there any chance you could send me a link to your battle_main.c? I am having a bit of trouble and it would be greatly appreciated.

WiserVisor · Jul 7, 2020

connormon1 said:
hey, is there any chance you could send me a link to your battle_main.c? I am having a bit of trouble and it would be greatly appreciated.

I've attached two versions of this file: the first one is what you can see here in my previous post. In the second one, I changed how the dynamicLevel accounts for player's who have a wide level spread on their team. It's a bit more strict. Choose whichever version you prefer.

How were you having problems with implementing this? It may be useful to know so that you can learn something for the future.

HeroSigma · Aug 2, 2020

WiserVisor said:
I've attached two versions of this file: the first one is what you can see here in my previous post. In the second one, I changed how the dynamicLevel accounts for player's who have a wide level spread on their team. It's a bit more strict. Choose whichever version you prefer.

How were you having problems with implementing this? It may be useful to know so that you can learn something for the future.

Is it compatible with Egg's upgrade?

WiserVisor · Aug 3, 2020

HeroSigma said:
Is it compatible with Egg's upgrade?

Yup. As far as I'm aware, Egg's upgrades didn't really mess with this file. I've also been using Egg's Battle Engine Upgrade myself, and this code works.

HeroSigma · Aug 4, 2020

WiserVisor said:
Yup. As far as I'm aware, Egg's upgrades didn't really mess with this file. I've also been using Egg's Battle Engine Upgrade myself, and this code works.

Thank you gonna use it now then

Diego Mertens · Sep 9, 2020

Wow, WiserVisor and DdraigZek, that's amazing! I'm adding your changes to the main post and my project, for sure.
All the things you guys did would have taken me a lot to figure out and discover, so thank you! (im adding your credits, too!)

vxo · Sep 12, 2020

And, above "gBattleTypeFlags |= gTrainers[trainerNum].doubleBattle;", paste this " dynamicLevel -= rand_diff + PartyLevelAdjust;"

You should be more specific with where this needs to be pasted, because "above" could be interpreted as:

Code:

dynamicLevel -= rand_diff + PartyLevelAdjust;
gBattleTypeFlags |= gTrainers[trainerNum].doubleBattle;

and not how it's intended to be:

Code:

            }
            }
            dynamicLevel -= rand_diff + PartyLevelAdjust;
        }
        
        gBattleTypeFlags |= gTrainers[trainerNum].doubleBattle;

Just a little mistake I made when implementing this, and I'm sure some others will have this issue as well.

Moistnar · Oct 8, 2021

Is there any way to implement this with wild Pokemon? Want to make an area with wild Audino that adjust to your level for easy grinding but not sure if this code can be applied like that

WiserVisor · Oct 8, 2021

Moistnar said:
Is there any way to implement this with wild Pokemon? Want to make an area with wild Audino that adjust to your level for easy grinding but not sure if this code can be applied like that

You can apply something similar to src/wild_encounter.c. In the function TryGenerateWildMon, you can add a conditional statement to check to see if the current wild pokemon is an Audino and some other condition, and then use elements of this code to generate a dynamic level based on the player's party to create a new level for the wild pokemon.

If you want every wild Audino to be dynamically leveled, it might look something like this:

Spoiler:

Code:

static bool8 TryGenerateWildMon(const struct WildPokemonInfo *wildMonInfo, u8 area, u8 flags)
{
    .................................................

    case WILD_AREA_ROCKS:
        wildMonIndex = ChooseWildMonIndex_WaterRock();
        break;
    }

    if(wildMonInfo->wildPokemon[wildMonIndex].species == SPECIES_AUDINO)
    {
        do
        {
            u16 dynamicLevel = 0;
	
            // This is used to hold the level's of the player's strongest[1] and weakest[0] Pokemon
            u8 LevelSpread[] = {0, 0};
	
            // This will be used when assigning the level of the opponent's Pokemon
            u16 PartyLevelAdjust;
    
            // Change stuff like this to get the levels you want
            static const u8 minDynamicLevel = 3;
            static const u8 maxDynamicLevel = 98;

            // Calculates Average of your party's levels
            for(i = 0; i < PARTY_SIZE; i++)
            {
                if(GetMonData(&gPlayerParty[i], MON_DATA_SPECIES) == SPECIES_NONE)
                {
                    if(i != 0)
		        dynamicLevel /= i;
                    break;
                }
                dynamicLevel += GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	        if(i == 0)
	        {
	            LevelSpread[0], LevelSpread[1] = GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	        }
	        else
	        {
	            u8 LevelCheck = GetMonData(&gPlayerParty[i], MON_DATA_LEVEL);
	            if(LevelCheck < LevelSpread[0])
	                LevelSpread[0] = LevelCheck;
	            else if(LevelCheck > LevelSpread[1])
		        LevelSpread[1] = LevelCheck;
	        }
            }
            if(i == PARTY_SIZE)
		dynamicLevel /= i;
            /* The following is used to account for a player having one or two very weak Pokemon
	       along with some very strong Pokemon. It weights the averaged level more towards the
	       player's strongest Pokemon
	    */
	
	    PartyLevelAdjust = LevelSpread[1] - LevelSpread[0];
	
	    if(LevelSpread[1] - dynamicLevel < 10)
	    {
		    PartyLevelAdjust = 0;
	    }
	    else if(LevelSpread[1] - dynamicLevel < 20)
	    {
		    PartyLevelAdjust /= 10;
	    }
	    else if(LevelSpread[1] - dynamicLevel < 30)
	    {
		    PartyLevelAdjust /= 5;
	    }
	    else if(LevelSpread[1] - dynamicLevel < 40)
	    {
		    PartyLevelAdjust *= 3;
		    PartyLevelAdjust /= 10;
	    }
	    else if(LevelSpread[1] - dynamicLevel < 50)
	    {
		    PartyLevelAdjust *= 2;
		    PartyLevelAdjust /= 5;
	    }
	    else if(LevelSpread[1] - dynamicLevel < 60)
	    {
		    PartyLevelAdjust /= 2;
	    }
	    else if(LevelSpread[1] - dynamicLevel < 70)
	    {
		    PartyLevelAdjust *= 3;
		    PartyLevelAdjust /= 5;
	    }
	    else if(LevelSpread[1] - dynamicLevel < 80)
	    {
		    PartyLevelAdjust *= 7;
		    PartyLevelAdjust /= 10;
	    }
	    else if(LevelSpread[1] - dynamicLevel < 90)
	    {
		    PartyLevelAdjust *= 4;
		    PartyLevelAdjust /= 5;
	    }
            //Handling values to be always be in the range,
            // ( minDynamiclevel-levelDifference , maxDynamiclevel+levelDifference )
            if(dynamicLevel < minDynamicLevel) dynamicLevel = minDynamicLevel;
            else if(dynamicLevel > maxDynamicLevel) dynamicLevel = maxDynamicLevel;

            level = dynamicLevel + PartyLevelAdjust;

            IF YOU WANTED TO ALSO ADD THE rand_diff STUFF, THE PREVIOUS LINE WOULD INSTEAD BE:

            level = dynamicLevel + PartyLevelAdjust + (Random() % 5) - 2;
        } while(FALSE);
    }
    else
        level = ChooseWildMonLevel(&wildMonInfo->wildPokemon[wildMonIndex]);
    if (flags & WILD_CHECK_REPEL && !IsWildLevelAllowedByRepel(level))
        return FALSE;
    if (gMapHeader.mapLayoutId != LAYOUT_BATTLE_FRONTIER_BATTLE_PIKE_ROOM_WILD_MONS && flags & WILD_CHECK_KEEN_EYE && !IsAbilityAllowingEncounter(level))
        return FALSE;

    CreateWildMon(wildMonInfo->wildPokemon[wildMonIndex].species, level);
    return TRUE;
}

This would always dynamically set every wild Audino's level based on the player's party. If you wanted the wild Audino to stick with their normal level in the case that the dynamic level is lower than their normal level, replace the last line in the do-while loop with this:

Code:

level = ChooseWildMonLevel(&wildMonInfo->wildPokemon[wildMonIndex]);
if(level < dynamicLevel + PartyLevelAdjust)
    level = dynamicLevel + PartyLevelAdjust;

If you instead only wanted certain wild Audinos to have dynamic leveling, you'll need to come up with another conditional to add to if(wildMonInfo->wildPokemon[wildMonIndex].species == SPECIES_AUDINO). For example, you could make every dynamically leveled Audino have a max level of 100. Then, you would add && wildMonInfo->wildPokemon[wildMonIndex].maxLevel == 100 to the if-statement.

I haven't actually tested if this code would work, but I feel fairly confident that it would properly dynamically level your wild Audinos.

Moistnar · Oct 15, 2021

WiserVisor said:
You can apply something similar to src/wild_encounter.c.

Thank you for this, it is very helpful. One last question, how do I test if the player is in a specific map? Suppose I wanted these Audino to only dynamically level in, say, Petalburg Woods--what conditional would I add to the if statement? Something like && MAPSEC_PETALBURG_WOODS == TRUE ? Not totally sure

WiserVisor · Oct 15, 2021

Moistnar said:
Thank you for this, it is very helpful. One last question, how do I test if the player is in a specific map? Suppose I wanted these Audino to only dynamically level in, say, Petalburg Woods--what conditional would I add to the if statement? Something like && MAPSEC_PETALBURG_WOODS == TRUE ? Not totally sure

When I initially wrote my previous post, I thought it wasn't really possible, since the map isn't passed in to the function. But as soon as I looked around for a couple seconds, I noticed you could use gMapHeader, which (I think) holds the current map data of wherever the player is.

If you wanted the Audino's in Petalburg Woods to be dynamically leveled, your if-statement would look something like:

Code:

if(wildMonInfo->wildPokemon[wildMonIndex].species == SPECIES_AUDINO && gMapHeader.regionMapSectionId == MAPSEC_PETALBURG_WOODS)

If I understand gMapHeader correctly, that should make all Audino's in Petalburg Woods have dynamic leveling. This a much better way of going about it then setting the max level to 100 and checking for that, so I'm glad you asked so I would be forced to a look for a better solution.

Velius Gefion · Jan 12, 2022

Regarding the Evolution Feature, I've encountered an error mainly about the "gEvolutionTable" being undeclared.
Am using the pokeemerald expansion if that information helps.

Lunos · Jan 12, 2022

Velius Gefion said:
Regarding the Evolution Feature, I've encountered an error mainly about the "gEvolutionTable" being undeclared.
Am using the pokeemerald expansion if that information helps.

I'll proceed to quote my post from another thread:

Lunos said:
To solve your problem you just have to define gEvolutionTable as an extern in the file where you intend to make use of it.
In other words, throwing in a extern struct Evolution gEvolutionTable[][EVOS_PER_MON]; somewhere near the top at src/pokedex.c should fix it.

Ex:

Note: Naturally, in this case, you'll want to put the declaration in src/battle_main.c because that's where you're invoking gEvolutionTable here.

[TUTORIAL] Set Trainer's Pokémon's Levels dynamically

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