[Phoenix Flame]

I typically power-level three characters (main 3 party leaders.) Afterwards, I try to have a balanced party consisting of two attackers and two magic users (ex: Terra - party leader, lvl 90; Relm - magic user; Locke - physical attacker; Cyan - phy. att.) I'd do the same for the other two parties and I'm good to mop the floor with the tower.

If you plan on using Mog as a party leader (due to the fact he can equip the Moogle Charm and avoid all random encounters) make sure to give him a little back-up for the goddess' statue you fight...although with your average level being in the 40s - you shouldn't have much difficulty...especialy with all the spells you've learned by now.