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Glitch Unown are invalid Unown in the Pokémon games.
In Generation II
In Pokémon Gold, Silver and Crystal, they can only be found in Unown Mode of the Pokédex through glitching or hacking.
They cannot exist as usable Pokémon without Game Genie.
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).
An example of a glitch effect 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.
- Using Coin Case arbitrary code execution or the Celebi Trick, obtain a ????? (hex:00 or hex:FF only).
- Get six party Pokémon, then via "Move PkMn W/O Mail" withdraw five more Pokémon, placing them in the first position each time.
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.
In Generation III
While in one of the Tanoby Ruins chambers in FireRed/LeafGreen, the following codes will modify the sprite ID of the Unown (the same as the index number). The codes do not modify the Pokémon found outside of the ruins (though it's unknown as of now whether it can be combined with an encounter modifier to battle Unown outside of the ruins).
Invalid values are the non-Unown index numbers (also given the name "Generation III hybrids") which may appear in a glitchy magenta color, as well as IDs 0x01B8+, which may appear as Unown with no sprite if they do not freeze the game.
Accessing Pokémon IDs 0-255:
0800F18C: 21XX - XX=ID
Accessing Pokémon IDs 256+:
0800F18C:31FF21XX - Encounter your index number (XX) + 255
In Generation V
Courtesy of SuprRooster, glitch Unown can be found with the following Action Replay code for Black 2, and will give the player 687 Master Balls and 100 Ultra Balls:
1. Give a Master Ball to any party/PC Pokémon
2. Press Select for 687 Master Balls.
3. Put the held Master Ball in the bag for 688 Master Balls; repeat step 1 the desired number of times for glitch Unown IDs 688-708.
94000130 FFFB0000 B2000024 00000000 00018D20 02AF0001 00018D24 00640002 D0000000 00000000 94000130 FEFF0000 B2000024 00000000 DA000000 00018D26 D7000000 00036B06 D3000000 00000000 B2000024 00000000 DA000000 00018D22 D7000000 00036B04 D3000000 00000000 B2000024 00000000 D9000000 00036B04 C0000000 0000000B D6000000 00036B04 D2000000 00000000