Trainer mutation glitch
Battle disabling Select glitch | Badge describer glitch | Dokokashira door glitch | Fossil conversion glitch | Item creation glitch | Lift glitch | Partial switch glitch | Remaining PP into species Select glitch | Second type glitch | Skip to Level 100 glitch | Trainer mutation glitch | Walk through walls | Warp by Nidoran♂ glitch
Trainer mutation glitch is a closed menu Select glitch in Pokémon Red, Green, and Pokémon Blue (Japanese).
Please note that this glitch only exists in the Japanese versions of the game, or is otherwise a glitch |
It allows the player to change what groups of Trainers in a map say, how they turn, and what class they are. If the new 'class' is less than 200 (C8), then they will turn into Pokémon. The player can also change the Pokémon's levels.
Unfortunately the player can't manipulate the species/class of the first Trainer IDs 1-4 in a map unless they have a Pokémon with specific stat experiences (so no 'fresh' Pokémon) but they should be able to manipulate others.
Basic steps
1) Press Select on the 20th item.
2) Exit and go into battle, then swap the 20th Pokémon with a Pokémon of your choice.
3) Without using a warp, go to a Trainer and they should have 'mutated'. Do note that a Trainer's text may freeze the game, and beware of Missingno. in Red/Green.
The game may freeze after the switch with no documented fix.
Technical details
Every Trainer on a map has an ID. This glitch lets you change the Pokémon (or Trainer) and level that a certain Trainer ID is. The ID can be tracked with memory viewer by talking to a Trainer and viewing address CC55, CD4F, or CF0E. As maps have multiple Trainers (and IDs), you can mutate more than one Trainer.
When you switch the Pokémon, you're actually switching the 20th Pokémon with the first. This puts various Pokémon data into unrelated data, and one group causes the Trainer mutation effects.
The changes are as such (for Pokémon 1):
Does not change: Trainer 01 turning data D463
Does not change: Trainer 01 text D464
Does not change: Trainer 02 turning data D465
Does not change: Trainer 02 text D466
Does not change: Trainer 03 turning data D467
Does not change: Trainer 03 text D468
Does not change: Trainer 04 turning data D469
Does not change: Trainer 04 text D46A
Does not change: Trainer 05 turning data D46B
Does not change: Trainer 05 text D46C
Does not change: Trainer 06 turning data D46D
Does not change: Trainer 06 text D46E
D12B Species byte 2 to Trainer 07 turning data D46F
D12C Current HP byte 1 to Trainer 07 text D470
D12D Current HP byte 2 to Trainer 08 turning data D471
D12E Level (possibly) to Trainer 08 text D472
D12F Status ailment to Trainer 09 turning data D473
D130 Type 1 to Trainer 09 text D474
D131 Type 2 to Trainer 10 turning data D475
D132 Catch rate to Trainer 10 text D476
D13F Attack experience byte 2 to Pokémon 1 species D483
D140 Defense experience byte 1 to Pokémon 1 level D484
D141 Defense experience byte 2 to Pokémon 2 species D485
D142 Speed experience byte 1 to Pokémon 2 level D486
D143 Speed experience byte 2 to Pokémon 3 species D487
D144 Special experience byte 1 to Pokémon 3 level D488
D145 Special experience byte 2 to Pokemon 4 species D489
D146 Attack & Defense DV to Pokémon 4 level D48A
D147 Speed & Special DV to Pokémon 5 species D48B
D148 PP of move 1 to Pokémon 5 level D48C
D149 PP of move 2 to Pokémon 6 species D48D
D14A PP of move 3 to Pokémon 6 level D48E
D14B PP of move 4 to Pokémon 7 species D48F
D14C Pokémon level to Pokemon 7 level D490
D14D Max HP byte 1 to Pokémon 8 species D491
D14E Max HP byte 2 to Pokémon 8 level D492
D14F Attack byte 1 to Pokémon 9 species D493 (not verified)
D150 Attack byte 2 to Pokémon 9 level D494 (not verified)
D151 Defense byte 1 to Pokémon 10 species D495
D152 Defense byte 2 to Pokémon 10 level D496
Example
Let's say you want specific Pokémon for Trainer IDs 02 through to 07 as such.
ID 02: Level 1 Mew ID 03: Level 254 Mewtwo ID 04: Level 5 Articuno ID 05: Level 5 Zapdos ID 06: Level 5 Moltres ID 07: Level 100 Porygon
This would require the following data from address D141:
15 01 83 FE 4A 05 4B 05 49 05 AA 64
And that is:
- Defense experience is 21 modulo 256.
- Speed experience is exactly 387.
- Special experience is 65098.
- Defense DV is 5, Attack DV is 0.
- Speed DV is 11, Attack DV is 4.
- Move 1 PP is 5.
- Move 2 PP is 73.
- Move 3 PP is 5.
- Move 4 PP is 42 w/2(?) PP Ups used.
- Pokémon is level 100.
Those requirements are totally unviable for non-cheat play, so it's a proof of concept, but you can get cool results with random Pokémon.
Youtube video
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