I would suggest fighting him when you get your fourth Enemy Skill materia, and let him cast Trine on you. That way you are able to get full sets of the four Enemy Skill materia, and also be at a fine level to woop his butt.

But if you really don't care about that... just level a bit perhaps. There's always the Regen trick where you cast Regen on yourself and open the disk drive (not reset the game) and it'll stall the game but keep healing you.