chaos: There is one item that can save your butt, and you can get it from the casino passport. Try racking up a lot of points in the casino, and, you can exchange them for the bravesoul. Equip it to chaos, and make sure he has the double buster, available in a segment address at the beginning of the KOSMOS simulator for chaos and Shion. chaos will probably do about 3000 each turn.

Rubedo: And don't forget to keep training, it works wonders!