@beaconofstrength: He could use disable which would hinder hulk.
He could use confusion which would confuse hulk.
Use a variety of moves to amp his attacks.
Make some earthquakes
Recover from what Hulk uses against him
Protect against whatever Hulk does
Use Grass knot (It's power depends on the weight of the opponent. Hulk is heavy)
Drain punch It steals the opponents hp)
Also that's how the attacks work. So don't try saying that they won't work.
Pokemon mechanics are very hard to compare. The best feats we have from mewtwo are from the first movie and from some statements. Hulk has tons of feats and it's more durable than mewto as far as we know.