Bites for around 400+ damage and inflicts Confuse and Poison. Thwacks for around 300+ damage to the front row. Pox deals about 600+ damage to your entire party and inflicts Defense Down. He tends to use Pox at lower HP.
Keep Poison and Confuse off your party with Basuna and Poisona. Keep your party under the Protect status throughout the fight, and use Protect-All to remove Defense Down following Pox. Keep your party topped off with Cura and Curaja. Use Boost Jump to inflict high amounts of damage to the boss. This fight is pretty straight forward.