Easy Level Ups
First, you have to unlock the Cave of Ordeals. Then get to stage 4. There are 2 rows of 4 puppets in an EXP +100% and mana +100% box, with several unused spaces. Get in one of the squares, and kill them all off. I did this with the monster's level about 500 and I went from 467 to nearly 600 after just a few battles.
To get Axel mode you have to use this code first put your cursor over start new game then press Triangle, Square, Circle, Triangle, Square, Circle, and finish it with X to Know that you have it right you should her Axel's Voice say "Show Time".