Originally Posted by Old Manus
Dark Bahamut
HP: 4,000,000
Dark Bahamut is an extremely hard boss. If you are having trouble, try beating Dark Yojimbo or Anima first, as they may be easier, depending on your stats. Many of these stats must be at the maximum figure. Unfortunately, you may still miss atacks. You can get a better chance by using Aim, but it wastes one of your very few turns.
After a couple of overdrives, Bahamut will open Impulse all over your ass. You will need Ribbon to protect its petrification. Then he will use Impulse then Mega Flare one after the other, which is a pain.
Bahamut's high Agility will mean that you will need max agility and evasion.
A good way to beat him is to enter battle will everyones full overdrive and use Attack Reels. Then Entrust someone else's overdrive to Wakka, and use Attack Reels again, etc. At least one person must have Auto-Pheonix on their Armour. Use Hastega at the beggining of the battle, then use Protect. If anyone gets any status effects, just kill them off and revive them with Auto-Pheonix. Summon Aeons to guard from overdrive attacks, and use overdrives themselves.