Jisho

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Wikipedia definition
1. MissingNo., 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.
Read “MissingNo.” on English Wikipedia
Read “けつばん” on Japanese Wikipedia
Read “MissingNo.” on DBpedia

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