I like "Freelancer" better than "Bare", but anyway...

As to the original topic, I don't know if it works on the other versions, but on the PS2 Anthology version equipping two swords and using Flare Sword! Magic on turn one followed by SShot! on subsequent turns = a load of hurt. You'll make eight hits each turn for damage depending on your level, I guess, up to several thousand damage each hit. That strategy slaughtered Shinryu as well in my game.

Tossing Magic Shurikens (four or five you can find in the N-Zone or buy some in Mirage IIRC--though I'm not sure whether they are better than CoinToss in terms of damage per $) can come close to doing max one-hit damage.

And as others have mentioned Bahamut is useful, especially for Neo X-Death.