OK...this isn't really a cheat but it really helped me out when i had to get my final form up to level 7....first use your drive form up (till it hits zero or until you don't want to use it anymore)...go to the underdome colliseum, enter the cup where you have to fight Cerberus (three headed dog) for the last level..after you win(if you do) your drive should be refilled...this doesn't always work...but it's only not worked for me like 2 times....Enjoy your drive being up and leveling up forms better..(this can also help to get up your summoning level because you need drive Gauge to summon)