Besides the tips that TreasonWall gave, here's some more things you might want to know:

- Edward with the Apollo's Harp (NA and PAL) or Loki's Lute (PAL version only) does super effective damage to him (9999 unless you're really underlevelled)
- Kain with Abel's Lance still has a chance of inflicting Tornado on him, despite being a boss type monster (making the battle ridiculously easy, if it activates)