This is a really lame cheat but it works. First, select the battle stage as 'Nintendo GameCube.' Then, gather the maximum amount of bombs you can carry (20) and ride right into a corner. When your opponent moves in behind you to toss a bomb on you, quickly turn so that you are still facing backwards but so that you are perfectly aligned with your opponent. Then, fire all of your bombs, QUICK! Be careful not to wait too long or else your opponent will fire at you and gain a star. If your timing is right, the bombs will bounce off the wall, over you and right into your opponent. As soon as you hit your opponent for the first time, take your time shooting the rest of the bombs, because if you go into a frenzy your bombs will just explode on the ground while your opponent is flying in the air.