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????? map corruption
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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 | Generation IV item cloning glitch (Japan only) | 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) | 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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????? map corruption, also known as "Missingning" is a glitch technique in Pokémon Gold, Silver and Pokémon 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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