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


GB.png Arbitrary code execution GB.png

0x1500 control code arbitrary code execution (Crystal) | Cart-swap arbitrary code execution | Generation I custom map script pointer | Generation I invalid meta-map scripts | Generation I item ("8F", "ws m", "-g m", "5かい", "てへ" etc.) | Generation I move ("-", "TM42") | Generation I Trainer escape glitch text boxes | Generation II bad clone | Generation II Burned Tower Silver | Japanese Crystal Pokémon Communication Center SRAM glitches | Coin Case glitch | Generation II glitch Pokédex sortings | Pikachu off-screen glitch ACE | OAM DMA hijacking | Pikachu glitch emote | Generation III glitch Pokémon summary | Generation III glitch move animation) | Remote code execution | TM/HMs outside of the TM/HM pocket | ZZAZZ glitch Trainer FC


Bulbasaur.png No further extensions Bulbasaur.png

Cloning | 99 item stack glitch (Generation I) | Ditto DV manipulation (Generation I) | Meta-map script activation (Generation I) | Expanded party encounter table manipulation (Generation I) | Item duplication glitch (Generation I) | Pokémon merge glitch ("Q Glitch", Generation I) | Bug-Catching Contest data copy glitch (Generation II, Japan only) | Time Capsule exploit | Berry glitch | Battle Tower Lati@s glitch (Generation III) | (Mimic) Transform Rage glitch (Generation IV) | Tweaking

Elite Four door glitch (Generation IV, Japan only) | Transform held item glitch (Generation IV, Japan only) | Mimic glitch (Generation IV, Japan only)


Bruno.png Buffer overflow techniques Bruno.png

LOL glitch | Rival LOL glitch | Instant LOL glitch | RAM LOL glitch | Out of bounds LOL glitch | 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 | Party Pokémon box data shift glitch | Unterminated name glitch item instant encounter (Japanese Red/Green)


Ball.png Item stack duplication glitch (Generation I) Ball.png

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


PC.png Bad clone glitch (Generation II) PC.png

????? 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 (Wrong pocket TM/HMs, Glitch Pokédex categories))


Lab pass.png Closed menu Select glitches (Japanese Red/Green) Lab pass.png

Dokokashira door glitch (International) | Fossil conversion glitch (international) | Second type glitch | Skip to Level 100 glitch | Trainer mutation glitch | Walk through walls (International) | Lift glitch | Badge describer glitch


Gromeg berry.png Pomeg glitch (Generation III) Gromeg berry.png

Pomeg data corruption glitch ("Glitzer Popping") | Charm glitch


Lying old man.png 2x2 block encounter glitches (Generation I) Lying old man.png

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) | Viridian Forest no encounter grass tiles glitch


Glitchtile.png Glitch City Glitchtile.png

Safari Zone exit glitch | RAM manipulation | Out of bounds Glitch City (Generation II) | Slowpoke Well out of bounds corruption (French Gold/Silver/Crystal)


RBYPC.png Large storage box byte shift glitch RBYPC.png

Storage box remaining HP glitch | Generation I max stat trick


Pikachu.png Pikachu off-screen glitch Pikachu.png

Trainer corruption glitch


Tereka.png SRAM glitches Tereka.png

Generation I save corruption | 255 Pokémon glitch | Send party Pokémon to a new game (Generation I) | Generation II save corruption | Mailbox glitches | Mystery Gift item corruption | Trainer House glitches


Ditto.png Trainer escape glitch Ditto.png

Death-warp | Ditto trick | Experience underflow glitch | Mew trick


Brock.png Walk through walls Brock.png

Ledge method | Museum guy method | Rival's effect | Select glitch method (International Select glitch method), Brock Through Walls


Surf.png Surf down glitch Surf.png

Grass/rock Surfing glitch (Spanish/Italian only) (adaptions: Submerge glitch (international)) | 8 8 (0x7C) grass/rock surfing glitch (English Red/Blue))

(view, talk, edit)
PRAMA Initiative a également une page sur Pokémon cloning (Generation II).
Bulbapedia also has an article about Pokémon cloning (Generation II).

The Pokémon cloning method in Generation II was among the first methods discovered and is arguably more well-known than the methods for Generation I.

Requirements

  • A Pokémon Gold, Silver, or Crystal Version cartridge.
  • An empty Box on the PC.
  • A Box that isn't full.
  • Pokémon to be cloned.
  • Another Pokémon to keep in the party.

Procedure

1. Save the game.

2. Deposit the Pokémon to be duplicated into a Box on the PC.

Gscclone1.png

3. Switch to an empty box on the PC.

Gscclone2.png

4. You will be prompted to save the game for changing the box. Choose "YES" to the prompts, but shut off the power three seconds after the game starts to say "SAVING...DO NOT TURN OFF THE POWER.".

Gscclone3.png

Results

When the game is turned back on, there should be the Pokémon deposited into the PC in your party, and it should also be in the Box where it was deposited.

Gscclone4.png

Another possibility is that there will be two of the Pokémon in the Box. [clarification needed]

Notes

  • Up to 5 Pokémon can be duplicated at a time under normal circumstances.
  • Items can be duplicated this way by making the cloned Pokémon hold the item to be cloned.
  • This can possibly damage the PC, and cause Pokémon to disappear. Details on this and why this can happen is not known.

Explanation

Saving the game for changing the box is handled a little differently than saving the game normally. It consists of three steps:

  • The contents of the active box (before changing) is saved to the SRAM.
  • The number of the active box changes, and the contents of the new box is loaded from the SRAM.
  • The game is saved as normal.

If the game is reset after step 1 has finished but before step 3 starts, then the contents of the active box is updated, but the party (a part of the main game data) is not, resulting in Pokémon cloning.

Although the save file is protected by a 16-bit checksum and a backup copy, they only apply to the main game data, so this glitch is not prevented. Furthermore, this means that even if step 3 has started, as long as the game hasn't finished writing the main save file, the main save file would likely be detected as corrupt and the backup would be used instead, resulting in successful cloning anyway. On the Crystal version, the timing window to get good clones is about 9~10 frames, making the glitch relatively easy to execute.

Interrupting step 1 by resetting may result in the bad clone glitch, which is much harder to execute due to a smaller timing window.