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?????????? is a Generation 3 Glitch Pokemon and is also known as ten question marks or it's fan given nickname, Decamarks. Decamarks is technically NOT a glitch pokemon as it's data was defined by the programmers. However, Decamarks can occupy other values of the 65535 slots that can be used as well as cause glitchy effects like freezing the game for certain variations like hex DEFD

Obtaining Decamarks
Decamarks can only be obtained with cheats like Action Replay Codes and Gameshark codes

Moveset
Decamarks' moveset varies based on which game you're playing and what it's hexadecimal identifier is. Some Decamarks don't even have moves and all they can use is struggle. Viewing a Decamarks' move tab while it has no moves will result in glitched text that has no known side effects.