With FuSoYa around it shouldn't be that difficult.

Scarmiglione - Blast him with Fire spells.
Rubicante - His cloak's open the entire fight, so just lay waste with Ice and Water magics.
Cagnazzo - Lightning magic. *yawn*
Barbariccia - Have FuSoYa blast her with Holy (9999 damage), and just cap away with Berserked Cecil and Edge, summon Bahamut if you got it before leaving the moon, otherwise have Rydia use Leviathan, and have Rosa on healing duty.