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MissingNo. (けつばん), or MissingNO, is a Pokémon species found in the video games Pokémon Red and Blue. Standing for "Missing Number", MissingNo. Pokémon are used as error handlers by game developer Game Freak; they appear when the game attempts to access data for a nonexistent Pokémon species. Due to the programming of three in-game events, players can encounter MissingNo. via a glitch. The species was first documented by Nintendo in the May 1999 issue of Nintendo Power.

Encountering MissingNo. causes graphical errors and the mass replication of the sixth item in the player's item menu; the latter effect resulted in the glitch's coverage by strategy guides and game magazines. IGN has noted MissingNo.'s appearance in Pokémon Red and Blue as one of the most famous video game glitches. Fans of the series have attempted to rationalize MissingNo. as canon, which has sparked discussion in sociological studies about the impact of video games upon society.

Developed by Game Freak and published by Nintendo, the Pokémon series began in Japan in 1996. The player assumes the role of a Pokémon Trainer whose goal is to capture and train creatures called Pokémon. Players use the creatures' special abilities to combat other Pokémon. (more...)