Quote Originally Posted by jebusabsolute
In D&D Bahamut is the king of the good dragons, while Tiamat is the leader of the evil ones.
It's that way in FF8 too. There Bahamut is the King of the Dragons, and Tiamat is the evil version of Bahamut. And while Bahamut uses Mega Flare, Tiamat uses Dark Flare. In FF4, Bahamut's nemesis was Wyvern (Dark Bahamut in FF4 J2e), and both dragons used Mega Flare.