B: Irken Lazer Gun: Fires lazer at opponent.
Up B: Spaceship: Flies his spaceship upwards. Lasts 2 seconds.
Side B: SIR Strike: Same as Olimar's in SSBB.
Down B: Irken Bomb: Throws a bomb in a slight arc.
B: Posess: Posesses nearest opponent, allowing MattBoo to control him until either 5 seconds passes or the possesed opponent gets knocked/jumps off the stage.
Up B: Spirit Realm: Enters the spirit realm for 3 seconds. In this state, he can fly freely, and pass though walls, on top of having every attack pass through him.
Down B: Spook: Scares the opponent, causing them to get dizzy.
Side B: MattBomb: Throws MattBomb at opponent: Works identically to Bob-Omb.