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Trainer mutation glitch
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Major glitches of the Pokémon series
"Core" glitch Variants and Consequences
Arbitrary code execution see template, remote, cart-swap, unintended ROM code execution
2x2 block encounter glitches Left-facing shore tile glitch (in-game trade shore encounter trick, old man trick, Trade link up shore encounter trick, Fight Safari Zone Pokémon trick)
99 item stack glitch ­
Bad clone glitch ????? party overloading (Type 0xD0 move glitch, ????? map corruption, Celebi trick, Celebi Egg trick, Shiny Celebi trick, glitch move map corruption, overloaded party map corruption, Glitch Unown (Glitch Unown map corruption) Duplicate key items glitch (infinite items and item creation, expanded Balls pocket (TM/HMs outside of the TM/HM pocket, Glitch Pokédex categories))
Berry glitch
Bug-Catching Contest data copy glitch (Japan only)
Ditto DV manipulation
Elite Four door glitch (Japan only)
Expanded party encounter table manipulation
Glitch City Safari Zone exit glitch, RAM manipulation
Glitch meta-map script activation (Generation I)
Infinite Master Balls (Colosseum)
Large storage box byte shift glitch storage box remaining HP glitch, maximum stat glitch
Item duplication glitch
Item stack duplication glitch Generation I expanded items pack (Glitch Rocket HQ maps, Map FE (English and non-English European Yellow), Map script pointer manipulation (arbitrary code execution, map script pointer item ball manipulation), Text pointer manipulation (arbitrary code execution, item ball manipulation, mart buffer overflow), Trainerless instant encounter glitch
Transform held item glitch (Japan only)
Mimic glitch (Japan only)
Out of bounds Glitch City (Generation II) Slowpoke Well out of bounds corruption (French version)
Lumiose City save glitch
Pikachu off-screen glitch Trainer corruption glitch
Pokémon merge glitch
Pomeg glitch Pomeg data corruption glitch
Roaming Pokémon encounter glitch
(Mimic) Transform Rage glitch
Select glitches (Japan only) Closed menu: Dokokashira door glitch (international), Fossil conversion glitch (international), Second type glitch, Skip to Level 100 glitch, Trainer mutation glitch, walk through walls (international) Special menu: Lift glitch, Badge describer glitch)
Sketch glitch
SRAM glitch (Generation I) 255 Pokémon glitch, send party Pokémon to a new game
SRAM glitches (Generation II) Mailbox glitches, Mystery Gift item corruption, Trainer House glitches
Surf down glitch Grass/rock Surfing glitch (Spanish/Italian only) (adaptions: Submerge glitch (international), 8 8 (0x7C) grass/rock surfing glitch (English Red/Blue))
Time Capsule exploit
Trainer escape glitch Death-warp, Mew Trick, Ditto Trick, Experience underflow glitch
Buffer overflow techniques Japanese unterminated name glitch item instant encounter glitch, LOL glitch, Rival LOL glitch, Instant LOL glitch, RAM LOL glitch, oobLG, blockoobLG, Instant encounter infinite chain glitch (LGFly)), Super Glitch (Generation I) (party remaining HP glitch), Super Glitch (Generation III), Text pointer manipulation mart buffer overflow glitch, CoolTrainer♀-type move, Double distort CoolTrainer♀ corruption, Yami Shop glitch
Walk through walls ledge method, museum guy method, Rival's effect, Select glitch method (international), Brock Through Walls
ZZAZZ glitch party Pokémon box data shift glitch

(view, talk, edit)
Please note that this glitch only exists in the Japanese versions of the game, or is otherwise a glitch
from a Pokémon game which was only released in Japan.

Trainer mutation glitch is a closed menu Select glitch in Pokémon Red, Green, and Pokémon Blue (Japanese).

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.

Original Address Original Address 1 data Destination Address Destination Address data
N/A N/A D463 Trainer 01 turning data
N/A N/A D464 Trainer 01 text
N/A N/A D465 Trainer 02 turning data
N/A N/A D466 Trainer 02 text
N/A N/A D467 Trainer 03 turning data
N/A N/A D468 Trainer 03 text
N/A N/A D469 Trainer 04 turning data
N/A N/A D46A Trainer 04 text
N/A N/A D46B Trainer 05 turning data
N/A N/A D46C Trainer 05 text
N/A N/A D46D Trainer 06 turning data
N/A N/A D46E Trainer 06 text
D12B Species byte 2 D46F Trainer 07 turning data
D12C Current HP byte 1 D470 Trainer 07 text
D12D Current HP byte 2 D471 Trainer 08 turning data
D12E Level (possibly) D472 Trainer 08 text
D12F Status ailment D473 Trainer 09 turning data
D130 Type 1 D474 Trainer 09 text
D131 Type 2 D475 Trainer 10 turning data
D132 Catch rate D476 Trainer 10 text
D13F Attack experience byte 2 D483 Pokémon 1 species
D140 Defense experience byte 1 D484 Pokémon 1 level
D141 Defense experience byte 2 D485 Pokémon 2 species
D142 Speed experience byte 1 D486 Pokémon 2 level
D143 Speed experience byte 2 D487 Pokémon 3 species
D144 Special experience byte 1 D488 Pokémon 3 level
D145 Special experience byte 2 D489 Pokémon 4 species
D146 Attack & Defense DV D48A Pokémon 4 level
D147 Speed & Special DV D48B Pokémon 5 species
D148 PP of move 1 D48C Pokémon 5 level
D149 PP of move 2 D48D Pokémon 6 species
D14A PP of move 3 D48E Pokémon 6 level
D14B PP of move 4 D48F Pokémon 7 species
D14C Pokémon level D490 Pokémon 7 level
D14D Max HP byte 1 D491 Pokémon 8 species
D14E Max HP byte 2 D492 Pokémon 8 level
D14F Attack byte 1 D493 (unconfirmed) Pokémon 9 species
D150 Attack byte 2 D494 (unconfirmed) Pokémon 9 level
D151 Defense byte 1 D495 Pokémon 10 species
D152 Defense byte 2 D496 Pokémon 10 level


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

YouTube video by ChickasaurusGL
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