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MissingNO, is an unofficial Pokémon species found in the video games Pokémon Red and Blue. Standing for "Missing Number", MissingNo. are used as error handlers by game developer Game Freak; they appear when the game attempts to access data for a nonexistent Pokémon species. The other MissingNO is 'M'. A picture of MissingNO. and "M" are here