Ultima is easy, it's Omega who is hard.

If you have Spd -J on everyone plus HP-J then light pillar doesn't pose much of a problem because he kills off two, then you just revive with your living character, maybe throw a megalixer if you have it.

I beat him on my first try following that strategy. I used Squall (9999hp), Quistis (9999hp, homing laser helps alot here), and Irvine(9999hp, Pulse ammo (or whatever it takes to make lionheart...i dunno if pulse is the name), and AP ammo, or Demolition). Autohaste on a character doesnt hurt either.

Revive is priceless in this battle. At least for me it was.

Good luck, I hope you don't get Light Pillared to death;