missingno was from blue and red version, it was a glitch in the game that allowed you to have infinite whatever and suped up pokemon. it really messed up your game. it wasn't anything to be greatful for.
--------------------------------------------------------------------------- Dragonite and Flygon ROCK!
"There be alot of long words in there miss, we're not but humble pirates." -Captain Barbossa, Pirates of the Caribbean: Curse of the Black Pearl
My Pokemon Diamond Friend Code: 3608 7561 2697 (my name is Diamond)
Missingo is a "virus" that results when you cheat too much in Pokemon Red + Blue. It bugs up your game, and it makes it so you don't find any wild pokemon except for two question marks. (That is Missingo) Missingo is nothing you want to get. In Emerald, Missingo takes the form of a white question mark inside a black circle. It is nothing important.