Choose SS Goku, Majin Vegita, and Bardock as a team for the best results. Use Goku first. Keep blasting him. Every time your energy level starts to go down too far, use Bardock and keep blasting. Eventually he will get around. However by the time he does that you will already have him down far. When your life gets into the red, use Goku's ultimate attack. If Goku dies, try the same technique with Majin Vegita. If you do not get it, try again.