To get an easier victory over someone, first immediately when the match starts, do your super attack. Then, charge up to 100%. Let your opponent charge to 50% or 100%. Let your opponent do his super attack and immediately when the blast comes out, quick dodge it by pressing the D-pad twice. Immediately when you dodge it, do your super attack. Your opponent may still be blasting when you blast. Therefore he will not move. Note: You are better off doing this if your opponent is in a corner.
When you have enough points, buy #18 on level three. Then, do any battle with her. She has infinite energy blasts because she is an android.
At the start of the battle, before your opponent has a chance to fight, use your weak attack by pressing B continuously. Do this until your power increases to 100%. Once this happens, use your strong attack by pressing A. After the strong attack, quickly use your super move by pressing A + B + R. Do this repeatedly. The timing must be precise or your enemy will hit you first. If you are losing, try using your super move and your strong power shot (A + R) repeatedly until you reach the correct moment to hit him. Note: Your opponent will dodge your hits -- the timing must be correct.