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????? map corruption
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Major glitches of the Pokémon series
Core glitch Variants, consequences, and exploits
Arbitrary code execution (various generations) see template, Remote code execution, Cart-swap arbitrary code execution, Unintended ROM code execution
No major extensions 99 item stack glitch (Generation I), Berry glitch (Generation III), Bug-Catching Contest data copy glitch (Japan only), Cloning, Ditto DV manipulation, Elite Four door glitch (Japan Diamond/Pearl only), Expanded party encounter table manipulation (Generation I), Item duplication glitch, Meta-map script activation (Generation I), Transform held item glitch (Japan only), Mimic glitch (Japanese Diamond/Pearl), Pokémon merge glitch ("Q Glitch", Generation I), Roaming Pokémon encounter glitch, (Mimic) Transform Rage glitch, Sketch glitch, Time Capsule exploit (Generation II), Tweaking (Generation IV)
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
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))
Select glitches (Japanese Red/Green) 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), Lift glitch, Badge describer glitch
Pomeg glitch Pomeg data corruption glitch ("Glitzer Popping")
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)
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, Send party Pokémon to a new game (Generation I), Generation II save corruption, 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))
Trainer escape glitch Death-warp, Mew trick, Ditto trick, Experience underflow glitch
Walk through walls Ledge method, Museum guy method, Rival's effect, Select glitch method (International Select glitch method), Brock Through Walls
ZZAZZ glitch Party Pokémon box data shift glitch

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????? map corruption, also known as "Missingning" is a glitch technique in Pokémon Gold, Silver and Crystal documented by Paco81, the discoverer of the bad clone glitch.

Viewing the summary of specific ????? in specific versions allows the player to cause map corruption, due to the Pokémon having a type with a name that is very long.

????? are obtainable through the bad clone glitch or Coin Case arbitrary code execution. If the bad clone glitch is used the player should initially receive a hex:00 ?????.

It can be converted into a hex:FF ????? after being taken into the Day Care and out again if moved to the top of the party with a party of six Pokémon and the "move PkMn w/o Mail" option is used to move a seventh Pokémon to the top of the party, which moves the hex:00/hex:FF ????? hybrid to the second slot of the party.

Applicable ?????

  • ????? (FF) - Pokémon Crystal JP.
  • ????? (00) - Pokémon Crystal EN (type hex:50).
  • ????? (00) - Pokémon Crystal ES — freezes believed to be less frequent than on the English version.
YouTube video by Pacoo81

Hex:FF ????? items and TM/HM pocket corruption in Japanese Crystal

The spot to secure a warp to the Bug-Catching Contest with the items and TM/HM pocket corrupted.

If the player views the summary of an hex:FF ????? at the specific spot in a Japanese version of Crystal, they may receive an announcement that the Bug-Catching Contest has ended (even if it was never started) and be warped to the results room.

Many items in the player's bag may become corrupted and the player may receive an expanded items pocket every TM/HM in the TM/HM pocket. From the corrupted pockets, an expanded Balls pocket can be obtained in which stored PC items can be used.

Hence having a TM/HM deposited is a gateway to arbitrary code execution, since TM/HM moves have invalid execution pointers when used outside of the items pack.

In particular, TM15 executes arbitrary code from FA10 (Echo RAM for DA10), which is somewhere in the expanded Balls pocket. If "(item) x195", "Star Piece x 252" (represents C3 84 FB - a jump to FB84, box 4 name character 2) are stored at DA0F, then this will serve as a bootstrap code to stored box Pokémon names.

(Youtube video of a Japanese Crystal TAS by ChickasaurusGL using hex:FF ????? to beat the game).


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