MissingNo. (source code)

= MissingNo.
{wiki=MissingNo.}

MissingNo. (short for "Missing Number") is a glitch character from the Pokémon video game series, particularly known from the original Pokémon Red and Blue games released for the Game Boy in the 1990s. It is not an intended Pokémon, but rather a result of programming errors that occur in the game. MissingNo. arises when the game encounters data it doesn't recognize, often when the player performs certain actions that exploit bugs in the game's code.