Missingno. (Japanese: けつばん Ketsuban) is a dual-type Bird/Normal glitch Pokémon in Red and Blue, and a dual-type Normal/999 glitch Pokémon in Yellow Version. Due to the ease of which it can be found, it is one of the best-known glitch Pokémon.In later generations, other glitch Pokémon are referred to as "a Missingno.", despite there being little relation to the one found in Red and Blue or Yellow Version.Missingno.'s cry is the game's equivalent of a "blank" cry: a Nidoran♂'s voice with a pitch of 0 and no echo. However, a few Missingno. have different cries.If Missingno.'s Pokédex data is viewed, it will consist of a very long string of glitchy sounds, much like .4 or h POKé's entries. However, unlike their entries, Missingno.'s does not lock up the game.
Wasn't this posted before?
oh nooo, your hall of fame is forgeted up, who cares, nobody looks at it anyway