An easy way to kill all Dragons. 1. Get everyone's Ninja and Red Mage jobs at least to level 4. 2. Equip Turn Tables ability. 3. Make everyone Ninjas, 'coz ninjas are cool. 4. Begin the battle. 5. Make everyone use Utsusemi. 6. That will generate tons of BP, which you can use to attack, while making you invincible. Just make sure your party is always under Utsusemi. Works against Vampire, too.