Decamark

??????????, also known as ten question marks or its fan-given nickname, Decamark, is a glitch Pokémon that occupies slot 0000, and all slots above 019D in Ruby, Sapphire, Emerald, FireRed, and LeafGreen. It was programmed into the game to prevent game crashes and is technically not a glitch Pokémon because its information was defined by the programmers. However, ?????????? can also occupy other values of the 65536 slots available as well as cause glitchy behavior in games, some specific versions may even freeze the game, such as hex DEFD.