Easily Defeat Seymour Omnis
First, have out Yuna, Tidus and Auron. Make Tidus use Hastega. Now, whatever element that Seymour is on, summon that Aeon that is that same element. For example, if he is on fire, summon Ifrit. Dont use any AEONS' overdrive unless it says in the help bar at the top that it deals non-elemental damage. If you do use an overdrive, it will heal him, at least according to his element. He will keep using Firaga or whatever and he will keep healing you, so don't worry about dying. Just use regular attacks. When he is changes elements, dismiss your Aeon and attack until it is Yuna's turn again. Then summon the same element as Seymour is. At the end, when he is about to die, summon Bahamut and use his overdrive.
Hope I Helped-1122andyozz33
Added by: 1122andyozz33 May 3rd 2009, ID#31916