Everything he has in the Marvel VS Cashcom games (jumping up, grabbing a meteor and smashing the opponent with it... smashing the ground and causing the ground to break) and green lazzzrebeamz out of his mouth.
On top of that he should be able to move at the speed of light, since gamma rays are energy and therefore as fast as light and therefore Hulk should be portrayed as a lightspeeder (according to some Hulk fans) and on top of that Hulk should be able to fly, since he already can leap into the orbit, so why not taking it to the next level.