I'm not sure how you fight it, but we just use blms in the air, sleep on the ground, so for us it translates into:
- Extra MDB while in the air.
- Auto-Regen
- Clear Mind for resting while its asleep on the ground, getting max mp.
- Erase your own slow.
- Stoneskin (usually eats 1 and a half air attacks for me)
- Curaga II spam (this is the big reason). We have the "tank" party at its feet at all times, so his wings/blasts/etc hit roughly 5-6 people, depending on whats going on. The enmity from just healing 5-6 people for 200+ hp multiple times in the air, while flashing etc, just seems awesome. On top of naturally reducing the number of healers you actually need. We found last time that we basically only needed one whm, and that was just for stona.
PLD/DRK would def. generate a ton of hate, but for Ouryu, where Stun isn't going to land anyway, the usefulness of basically turning your main tank into your main healer, while also taking less magical damage (the only kind ouryu really does for us) is pretty sweet.