"Mr. Mime is a master of pantomime. Its gestures and motions convince watchers that something unseeable actually exists. Once the watchers are convinced, the unseeable thing exists as if it were real."
Just when you think it's safe to say that Pokemon won't ever truly become like humans...you see Mr. Mime. *sigh*. Seriously though, Mr. Mime is one odd Pokemon, but it's also very powerful, in one of its first appearances on the anime, it was able to create very real walls to trick people and imprison people like Team Rocket. It's now an assistant to Ash's mom, Delia.
Mr. Mime's Basic Attack is Confusion, while its Special Attack is Shadow Ball.