How I beat him.

Quina Lvl 50- Auto-Life, Angel Snack
Zidane Lvl 50- Throw my one dark matter, be one hit away from trance, use it if you get it.
Eiko Lvl 50- Healer (does more reviving then healing), Rebirth Flame
Steiner- Shock

Yeah, I beat him at a level I don't really recommend