Bug-Catching Contest data copy glitch

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Major glitches of the Pokémon series

Arbitrary code execution

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

No further extensions

Cloning | Item duplication glitch (Generation I) | Pokémon merge glitch ("Q Glitch", Generation I) | Time Capsule exploit | Bug-Catching Contest data copy glitch (Generation II, Japan only) | Berry glitch | Battle Tower Lati@s glitch (Generation III) | (Mimic) Transform Rage glitch (Generation IV)

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

Buffer overflow techniques

99 item stack glitch | 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)

Item stack duplication glitch (Generation I)

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

Bad clone glitch (Generation II)

????? 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))

Closed menu Select glitches (Japanese Red/Green)

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

Pomeg glitch (Generation III)

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

Voiding (Generation IV)


Broken escalator glitch (Japan only) | Elite Four door glitch (Japan only)

2x2 block encounter glitches (Generation I)

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

Glitch City

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

Large storage box byte shift glitch

Storage box remaining HP glitch | Generation I max stat trick

Pikachu off-screen glitch

Trainer corruption glitch

SRAM glitches

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

Trainer escape glitch

Death-warp | Ditto trick | Experience underflow glitch | Mew trick | Text box ID matching | Meta-map script activation

Walk through walls

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

Surf down glitch

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

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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.

Bulbapedia also has an article about Bug-Catching Contest data copy glitch.

The Bug-Catching Contest data copy glitch is a glitch in Japanese versions of Pokémon Gold and Silver.


The Bug-Catching Contest data copy glitch allows you to make a hybrid between the second party Pokémon and the sixth party Pokémon. So it is possible to merge a Pokémon to have the same DVs, gender, moveset and stats as another (similar to the Pokémon merge glitch also found in Generation I). This is useful for creating new Shinies between the Red Gyarados and another Pokémon, if the new hybrid Pokémon can be stabilised through evolution.

It is a rare example of a glitch which only exists within the Japanese versions of Pokémon Gold and Silver. It was later fixed in other localizations of Pokémon Gold and Silver and it does not exist at all in Pokémon Crystal.

This glitch exploits the Bug Catching Contest in a similar way to the Glitch City glitch, but it requires the player to wait until a day when the next Bug Catching competition is on (Tuesday, Thursday, or Saturday) first and then to wait another two days (or corrupt the time via a glitch such as one that causes a Glitch Dimension to bring up the clock reset menu on start-up) to finish the glitch. Unfortunately, it seems any button sequences to manually reset the clock were introduced in the localisations, rather than the original Japanese games.


  • Access to the Bug Catching Competition
  • A Pokémon with Fly or Teleport (Abra with Teleport can be caught on Route 34; 10% encounter chance all day)
    • If using Fly: to have beaten Chuck and obtained the Storm Badge.
  • A Pokémon to have its data copied.
  • A Pokémon with the desired species for the outcome.
  • Three spare Pokémon.
  • The day has to be Tuesday, Thursday or Saturday.
  • Time (to wait two days).
  • An empty box.


1) Arrange your party like this: Flying/Teleporting Pokémon, desired species (e.g. Charizard), three spare Pokémon, Pokémon to have its data copied (e.g. Red Gyarados).

2) In an empty box, deposit the three spare Pokémon as well as the Pokémon to have its data copied last.

3) Enter a Bug Catching competition, then immediately walk out.

4) Choose 'NO' and come back in, and then Fly away.

5) Deposit the desired species below the Pokémon that's going to have its data copied.

6) Save the game and wait until the next Bug Catching competition.

7) Return (if you enter the south entrance, you should walk through the void). The game will say that you still have 1 minute left.

8) Choose Yes to finish the contest.

9) You should have a Pokémon that's the species of the last Pokémon you deposited but has the stats, gender, DVs (including shininess), and moves of the donor.

????? (0x00) exploit

It is possible to get a hybrid between party Pokémon 2 and a ????? (0x00) if no Pokémon was ever present in the sixth slot of the party. Taking it in and out of the Day Care converts it into a non-hybrid ????? (0x00) which can be used for ????? party overloading. So this in turn can be used to set up glitches such as Celebi Egg glitch and duplicate key items glitch (for access of wrong pocket TMs and HMs or glitch Pokédex sortings/bag corruption and arbitrary code execution).

YouTube video by ChickasaurusGL

YouTube video

YouTube video by ChickasaurusGL