Missingno.

High Quality Content by WIKIPEDIA articles! MissingNo. (けつばん, Ketsuban?), or MissingNO, is a Pok�mon species found in the video games Pok�mon Red and Blue. Standing for "Missing Number," MissingNo. Pok�mon are used as error handlers by game developer Game Freak; they appear when the game attempts to access data for a nonexistent Pok�mon 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.