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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Glitch Unown are invalid Unown in Pokémon Gold, Silver and Crystal that can only be found in Unown Mode of the Pokédex through glitching or hacking.
They cannot exist as usable Pokémon, because every set of DVs counts as a valid Unown letter.
Some variants of these glitch Pokémon have indecipherable sprites, kind of like glitch Pokémon from Generation I. Others such as the Gold/Silver:254 kind use a sprite that shows all Unown icons from A-Y in five columns, in a 'down, then next column' order. Other glitch Unown are a combination of both of the possible appearances explained above.
Many of the glitch Unown cannot be seen as they either freeze the game, or reset it into a Glitch Dimension.
Glitch Unown are different between Gold/Silver and Crystal.
In Pokémon Crystal, at least the hex:FB glitch Unown has a sprite that looks like a corrupted version of another Pokémon's sprite (i.e. Noctowl for FB).
A notable glitch caused by a glitch Unown is Ilsty and ?. The game will switch to the evolution screen and act like a Pokémon named "Ilsty" is evolving into a Forretress, and then have a Graveler named "?" evolve into Golem.
Obtaining Glitch Unown
Glitch Unown can be obtained in Gold/Silver with ????? party overloading or through cheating.
Withdraw over 6 Pokémon method
Note: This has only been confirmed in Gold/Silver.
First prepare at least Pokémon five boxed Pokémon, and a full party with the fifth party Pokémon having a Defense modulo 256 byte (DB13) of your choice. Both the party Pokémon and the boxed Pokémon should be nonvaluable.
The value from DB13 will be written to the first Unown in the UnownDex, but the player's Pokédex seen and own addresses will be corrupted, causing the player to end up with different Pokédex in the Pokédex, so a player should not do this glitch if they have a complete Pokédex and don't want to lose it.
The GameShark code 01xx24DC (Pokémon Gold/Silver) or 01xxD9DE (Pokémon Crystal) will replace the first Unown in the Pokédex's Unown Mode.
Gallery (Pokémon Gold and Silver)
A glitch Unown with a blank appearance and a hexadecimal identifier of FD (dec:253).
A glitch Unown with a sprite that shows all Unown icons from A-Y in five columns, in a 'down, then next column' order. Hexadecimal identifier FE (dec: 254).
Some of the glitch Unown look kind of like certain glitch Pokémon in Red, Blue and Yellow. This glitch Unown has a hexadecimal identifier of FC (dec: 252).
Some of the glitch Unown look similar to both Unown with a hexadecimal identifier of hex:FD (dec: 253) and hex:FC (dec: 252).
Gallery (Pokémon Crystal)
A glitch Unown with a blank appearance in Pokémon Crystal. It has a hexadecimal identifier of FF (dec: 255)
This glitch Unown has a hexadecimal identifier of FE (dec:254). Black and white vertical 'pipes' can be seen.
A glitch Unown with a hexadecimal identifier of FC (dec:252). Black and white vertical 'pipes' can be seen like FE (dec:254) but the overall shape is centered and like a square.
A glitch Unown with a hexadecimal identifier of FB (dec:251). It incorporates parts of Noctowl's sprite.
- Ilsty and ?