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Pokémon cloning (Generation I)
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Major glitches of the Pokémon series

Arbitrary code execution (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) | Cloning | 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) | Surf down glitch (Grass/rock Surfing glitch (Spanish/Italian only) (English)) | Time Capsule exploit | SRAM glitches (Generation II) (Mailbox glitches, Mystery Gift item corruption, Trainer House glitches) | Tweaking | 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)

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This article is a summary page for different variations of a glitches, etc. when talked about as a whole.
PRAMA Initiative a également une page sur Pokémon cloning (Generation I).

Pokémon cloning refers to natural glitches which allow the player to keep two copies of the exact same Pokémon. There are two known methods to do this in Pokémon Red, Blue, and Yellow.

Save menu method

This method was documented by Paco81. It is very risky and the save file could be destroyed if the timing when resetting is bad, but works.


  • Save the game in front of a Pokémon Center's PC.
  • Deposit a Pokémon into the Pokémon Storage System.
  • Attempt to save the game, but reset the game as soon as the Yes/No box disappears in "Would you like to SAVE the game?" without the text updating.
  • If done correctly, the player will have the same Pokémon in the party and storage system.
YouTube video by Paco81

Cable Club method


  • Two cartridges that are both Pokémon Red, Blue, or Yellow Version.
  • The Pokémon to be cloned.
  • A Pokémon to be lost during the process (not on same game as the one to be cloned).


  1. Link the two games and go to a Pokémon Center.
  2. Go to the Cable Club and enter the Trade Center.
  3. On one game, trade the Pokémon to be cloned, and on the other, trade the one to be deleted.
  4. On the game originally having the Pokémon to be cloned, reset the game without saving. On the game where that Pokémon now resides, save.


The Pokémon to be cloned should now exist on both games, and the other Pokémon should be overwritten by one of the clones.

How it works

Simply because the game was not saved after the later deleted Pokémon was obtained, the save data still says that the player has the cloned Pokémon. On the other game, it was saved with the cloned Pokémon on it, so then both games have the same Pokémon.

See also