Tutorial: How to Get and Set stats such as EV and IV

[Ashingda]

This is a bit more detailed explanation on how to get and set stats, specifically the EV and IV stats.

In this tutorial we will be exploring how to:
1. Insert ASM routines
2. Hijack existing scripts
3. Using the ASM to get the values of an IV
4. Also how to set an IV with a new value

The final result will be that one of the assistant (middle one) will be able to tell you a Pokemon's HP IV and then increase it by 1, using a dialogue.

Get Value

Spoiler:

.text
.align 2
.thumb
.thumb_func

/* Uses:
0x8003: Which stat to affect. Example: 27 = HP IV
0x8004: Party slot number, best used with Special 0x9F
0x8005: Ouputs the value of affected stat
*/

main:
push {r0-r2, lr}

ldr r0, =(0x20370C0) @var 0x8004: PartySlot
ldrh r0, [r0] @Halfword

mov r1, #0x64 @Offset
mul r1, r1, r0 @Offset * PartySlot

ldr r0, =(0x2024284) @Pokemon
add r0, r0, r1 @Pokemon + Offset

ldr r1, =(0x20370CC) @var 0x800A: StatID
ldrb r1, [r1] @Byte

@var 0x800B: Output

@DeCrypt---------------------------------------------------------
/* Note:
r0 Must be Pokemon data Offset
r1 Must be which stat to affect
-After-
r0 Will be returned with the value of Pokemon's stat
*/
ldr r2, =(0x803FBE8+1)
bl linker @DeCrypt

ldr r2, =(0x20370CE) @var 0x800B: Output
strb r0, [r2] @Byte

pop {r0-r2, pc} @end

linker:
bx r2

.align 2

Set Value

Spoiler:

.text
.align 2
.thumb
.thumb_func

/* Uses:
0x8003: Which stat to affect. Example: 27 = HP IV
0x8004: Party slot number, best used with Special 0x9F
0x8005: New value to set the affected stat.
*/

main:
push {r0-r3, lr}

ldr r0, =(0x20370C0) @var 0x8004: PartySlot
ldrh r0, [r0] @Halfword

mov r1, #0x64 @Offset
mul r1, r0 @Offset * PartySlot

ldr r0, =(0x02024284) @Pokemon
add r0, r0, r1 @Pokemon + Offset

ldr r1, =(0x20370CC) @var 0x800A: ID of stat
ldrh r1, [r1] @Halfword

ldr r2, =(0x20370CE) @var 0x800B: New value
ldrh r2, [r2] @Halfword

push {r2}
mov r2, r13

@Note:
@r0 Must be Pokemon data Offset
@r1 Must be which stat to affect
@R2 Must be the new value to set

ldr r3, =(0x0804037C+1) @EnCrypt
bl linker
pop {r2}


ldr r0, =(0x20370C0) @var 0x8004: PartySlot
ldrh r0, [r0]

mov r1, #0x64 @Length
mul r1, r0 @Offset * PartySlot
ldr r0, =(0x02024284) @Pokemon
add r0, r0, r1 @Pokemon + Offset

@Note:
@r0 Must be Pokemon data Offset

ldr r3, =(0x0803e47c+1) @CalculateMonStats
bl linker

pop {r0-r3, pc} @end

linker:
bx r3

.align 2

 

[DjTarma]

This has been something the community has long wanted!
It is impossible not to help you expand the options available in this repository.
So let's go:

- First Script = Change Pokémon's Pokéball.
First, that's the Pokéballs value of a Fire Red vanilla hack:

Spoiler:

0 - DO NOT USE THIS VALUE!
1 - Masterball
2 - Ultraball
3 - Greatball
4 - Pokéball
5 - Safariball
6 - Netball
7 - Diveball
8 - Nestball
9 - Repeatball
A - Timerball
B - Luxureball
C - Premierball
D - DO NOT USE ANYTHING FROM HERE.

This is a good example of how the NPC can be:

Spoiler:

#dynamic 0x800000

#org @start
lock
faceplayer
msgbox @text1 0x4
msgbox @text2 0x5
compare 0x800D 0x1
if 0x1 goto @service
compare 0x800D 0x0
if 0x1 goto @nope
end

#org @nope
msgbox @text7 0x4
release
end

#org @service
msgbox @text3 0x4
setvar 0x8003 0x26
callasm 0x87FFE31
special 0x9F
waitstate
compare 0x8004 0x6
if 0x4 goto @nope
goto @step1

#org @step1
setvar 0x8003 0x26 'Pokéball command'
setvar 0x8005 0x_ '---> Use the values start to 0x1 to 0xC.
callasm 0x87FFE81 'This confirms the change made.
goto @final

#org @final
msgbox @text4 0x4
msgbox @text5 0x5
compare 0x800D 0x1
if 0x1 goto @service
compare 0x800D 0x0
if 0x1 goto @ending
end

#org @ending
msgbox @text6 0x4
release
end

#org @text1
= Hello, I'm the Pokéball Changer.

#org @text2
= Do you want to change your\nPokémon's Pokéball?

#org @text3
= Please, select a Party Pokémon.

#org @text4
= I've changed your Pokémon's\nPokéball to an Ultra Ball. '----->If you have changed the setvar 0x8005 0x_ to 0x2.'

#org @text5
= Do you want to change other\nPokémon?

#org @text6
= Thank you for using my service.

#org @text7
= Oh, okay then.

 

[MistaFish]

This is a bit more detailed explanation on how to get and set stats, specifically the EV and IV stats.

In this tutorial we will be exploring how to:
1. Insert ASM routines
2. Hijack existing scripts
3. Using the ASM to get the values of an IV
4. Also how to set an IV with a new value

The final result will be that one of the assistant (middle one) will be able to tell you a Pokemon's HP IV and then increase it by 1, using a dialogue.

Download Link:
https://www.mediafire.com/file/hossjc75t5p6543/Stat_Tutorial.7z/file

[Updated] Down below is the ASM code to recalculate the stat changes to the pokemon. Call it after changing the EV or IV.

Spoiler:

.text
.align 2
.thumb
.thumb_func

main:
push {r0-r1, lr}

ldr r0, =(0x20370C0) @Var 0x8004: PartySlot
ldrh r0, [r0]
mov r1, #0x64 @Length
mul r1, r0 @Offset * PartySlot
ldr r0, =(0x02024284) @Pokemon
add r0, r0, r1 @Pokemon + Offset

bl CalculateMonStats @Function

pop {r0-r1, pc}

CalculateMonStats:
ldr r1, =(0x0803e47c+1)
bx r1

.align 2

Is there any way that something like this could work for Emerald? I've been scouring the web for a way to change IVs and have been coming up empty.