Everyone as freelancer, give everyone !Image and give 3 Black Magic level 5+, and one of them !Time level whatever you need for Hastega. Equip shields instead of dualwielding, and put them all on the back row.

Keep !image up during the entire battle, and make sure you Float everyone on beforehand or during the battle, then blast it with Blizzaga. Even should you get unlucky, and a character with just one mirror image get attacked twice in a row, you've still got a 45% evasion from the shield. If it still connects, it's rather low damage because of being at the back row. If you feel like it, you could probably get one !White instead of one !Image or !Black.

!Image is god versus all-physical enemies.