Confusion

Confusion is a move that only Mewtwo can use in Super Smash Bros. Melee. It is his Smash B move. If done correctly, Mewtwo will use psychic energy to flip any player in front of him. This can be used to stop the opponent in his/her tracks if he/she's trying to attack, or it could be used to distract the opponent so that Mewtwo can escape. Confusion can also be used to block projectiles, like Link's Bow, or Mario's Fireball. It can be treated as a replacement for the shield.

Confusion is in fact one of Mewtwo's attacks from the Pokémon series.