If you have a GF who has learned "Boost," this trick will work. While your GF is about to appear on the screen, hold down "Select" and you should see a hand pointing a finger on the "Square" button and a number next to it. Keep holding "Select" and rapidly hit "Square" This will raise that number which means more damage to the enemy. But make sure you stop when an X appears over the hand. If you don't, the number will start back at the beginning. Wait for the X to go away and repeat the process. The higher the number reached, the more damage caused.