'M is a name shared by a limited number of glitch Pokémon found in the Generation I Pokémon games. Generally, the name 'M is used to refer to the most common of these glitches, whose internal identifier is 00. This 'M is extremely similar to a specific variant of MISSINGNO., and is mostly harmless. It will, however, freeze the game if a player attempts to withdraw it from a PC box if it is Level 0; this has led to misconceptions that it is very dangerous and possibly game-breaking. It can even delete your save file, But of course, not by catching it. Instead, it deletes the file because Bill's PC doesn't know how to process Level 0 Pokémon.