Battle Fantasia

This can be done with two controllers (VS 2p), or online (Network).

The easiest way to get this trophy is to use two controllers in VS 2P mode. Pick the same character. Take turns hitting each other with the same attack until each opponent only has one hit remaining. Position your characters arms length away (so their knuckles will hit). Then, do the same attack simultaneously. If done correctly, both opponents will die and the trophy should pop up. If not, try again.