One attack that you can prevent entirely is his Quake spell. Junction 100 Quake to Elem-Def.

Don't forget to draw Eden as well. It's the most powerful GF and you don't want to win an incredibly hard battle and then have to restart all over again.

You can also Mug a Three Stars from Ultima Weapon, but I recommend that you don't Mug him and get 100 Ultima Stones instead for winning the battle.