Dragon Ball Z: Supersonic Warriors 2

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.

After completing Mania Rank, highlight Super Vegeta (DP5), hold R & press A.

Complete the indicated tasks in Maximum mode for more DP.

Increase DP by 1: Complete 5 or 6 levels.
Increase DP by 1: Complete Novice mode.
Increase DP by 2: Complete Hard mode.
Increase DP to unlimited: Complete Mania mode.

Complete any of the indicated tasks to get an Extra Support.

At the main menu, go to the options and view the credits. After all of the credits are done, wait a short time. The music should still be playing and you should still be at the credits screen. When the music stops, a box will appear on the screen stating "Support character increased by 1".
Complete all the exercises in the tutorial.
Complete every level in all characters' storyline. This will take some time, but is worth it to anyone who likes to use supports.
Complete Z Battle mode.

Have Goku (DP3), Vegeta (DP3), & Piccolo (DP3) on a team & execute a Team Art (200% Energy, then tap the button on the Touch Screen). Goku, Piccolo, & Vegeta use Kamehameha, Special Beam Cannon, & Galick Gun on the enemy.