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Surf and Special 0x12b Hack
(for Fire Red only)Also see:
Changing Waterfall: http://www.pokecommunity.com/showpost.php?p=8496240&postcount=3
Changing Fly: http://www.pokecommunity.com/showpost.php?p=8505424&postcount=8
Changing Flash: http://www.pokecommunity.com/showpost.php?p=8505791&postcount=14
Goal and achievement:
My goal during the recent days was to mimic the anime in terms of how trainers commute in the water. I decided to try and make it so that if you have a water type Pokemon you can surf, regardless of move pool. As such, below is a semi-guide/resource to functionality of how you can implement such a feature yourself! You will also find my (and Touched's) implementation of a special that checks your party for a certain type of Pokemon.
Thought process and reasoning:
I've been trying to figure out how to remove the badge and HM requirement for surfing. I found
The script and removed the move requirement, but it seems I still can't bring up the surf script even with the badge. It seemed to keep checking if a Pokemon has learned surf before allowing me to activate the script. I wasn't quite sure where the second check is taking place, so I kinda backtracked..and landed on quite the peculiar structure.
Structure so far (forgive my formatting):
Code:
0806D548 - start
- operations
0806D550 - tile behavior check (may be height check)
compare behavior 0x0 or 0x1 (waterfall vs surf ...I think)
B 0806D570 - if surf goes here, else keep going
BL to 0805C83C - nested for loop. Loops Pokemon and moves (using move decryption, this is for waterfall)
compare move found (searches for waterfall I think)
B 0806D570 - if move found goes here
B 0806D5E2 - if not found goes here (a routine exit)
at 0806D570
ldr r0, [0x806D59C]
B 0806E6D0 (flag checker, the gym flag folks)
Check to see if var is 0x1 (that is the gym flag is set)
if not set B 0806D5A4
else run function BL to 0805C83C - nested for loop. Loops Pokemon moves (this one is for SURF!)
@ 0806d586 - checks for the surf (real check!)
if surf found B 0805C8B0 - collision detection
check no collision, - Execute -
And then a bunch of things we don't really care about.So now you ask, how do we remove the HM requirement?! It's simple, you remove the else condition in the check. I.e pad it with 0s.
The solution to removing HM Surf from the picture:
At 0x6D588 - 0x6D589 change 0C D1 to 00 00.
Now what this exactly does is remove the check (outside of the script) for surf. However, surf is still checked for in the script itself.
You need to edit the script to whatever it is you wanted the surf condition to be, OR, you can use the edited version of special 0x12b I will talk about shortly.
Introduction to the special:
Thanks to Jpan's research on specials I found out that special 0x12b was a special which would tell you if your party had a grass Pokemon. Quite simple, and to be honest, very useless. However this special did do a few things internally that are actually worth using. It ran through your entire party and checked your Pokemon's type (and the check supported dual types, that is Pokemon like Venasaur would be flagged as grass too). So if we can modify the special to work for any type we specify would that be useful? What if we were also able to return the slot of the Pokemon who was of that type? Yes, please :PThe original (starts at 080CA804):
Spoiler:
I haven't explained some of the parts about getting Pokemon from part and looking it up in the table, but if you have questions I can answer.
The part of the code which we may be interested mostly by is the check part. It checks for 0xC (for grass) at the Pokemon's Type 1 and Type 2 slot. If you want you can change this statically to match a type of your choosing by simply modifying 0xC to a type you wanted to check.
Types are defined like this:
Spoiler:
However, Touched and I made this routine for the check part :
A)
Spoiler:
What it does is compares the type 1 and type 2 to a variable (in this case 0x8000). If a Pokemon of that type is found we return into 0x8000 the slot of that Pokemon from 0 to 5, returning a 6 if no Pokemon of that type was found. Note that the variable can be changed to another variable, though careful which you use (encrypted variables and 0x800D, 0x800E, 0x800F don't work since we'd never be able to check the last result without overwriting it and similar situations with the rest.
Inserting:
To insert this into your FR ROM, you need to assemble it into free space and call it.
We overwrite the line ldrb r0, [r1, #0x6] and whatever else we need with a bx.
That is:
Code:
ldr r0, = Routine +1
bx r0To insert this, first assemble A). Put it into some free space (even ending). If you don't know how to assemble it's:
Code:
06 4A 12 78 88 79 90 42 02 D0 C8 79 90 42 03 D1 28 1C 70 BC 02 BC 08 47 01 48 00 47 B8 70 03 02 59 A8 0C 08Now go to 0xCA840, and insert:
Code:
00 48 00 47So if I inserted at 7266B0, then
7266B0 = 087266B0
087266B + 1 = 087266B1
087266B1 = B1 66 72 08 (you insert this after 00 48 00 47).
Finally we want to return 6, if there isn't a Pokemon in the party of the type we specified. Go to 0xCA862 and change 00 to 06. That's it!
Sample Script:
PKSV
Spoiler:
XSE:
Spoiler:
Note: The Pokemon's slot number is stored in whichever variable you give it. You can feed it 0x8000 if you wanted to use only 1 variable.
Extras (Surf hack + Special in conjunction):
PKSV script
Spoiler:
XSE:
Spoiler:
End:
I hope you found the hacks/research, or at least the special useful :)If you use either, please give credit to Touched. I don't particularly require credit, but if you want, please do give :P
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