Steiner casts shock every turn
Dagger or eiko heal
zidzane attacks taking 6000-7000 per turn
vivi casts flare (if he has doomsday that would be great)
2 characters are equiped with Pumices peices and the other 2 are equiped with Eigoists Armlet to not receive any damage from shadow damage
u should win if it doesnt cast meteor
the whole battle is basically about luck