Quote Originally Posted by Wolf Kanno View Post
I'd say Lv. 60 is ideal. If that's not working, then just level until Rydia learns Meteor.
Meteor takes too long, my dad used Meteor (Meteo as it was called) when I was a little kid and we were playing the Super NES port, I've discovered summoning Bahamut in the long run seems to do more in 2 turns than waiting on 1 turn for Meteor, though I'll admit level grinding to 60 or higher is a good idea.

On another note for the future people needing advice, Big Bang does damage and gradually damages the party little by little, so Big Bang and hiting him with magic causing him to counter with Tornado will KO a party member instantly, so watch when you use magic on him if you do.