ze uber aeons

[Mirage]

I dont use my aeons as shields... thats what auto-life is for.

Auto-Life = slow. It needs extra turns what can be used better and you can have Auto-Phoenix what is much much better. Zanmato = game over even with Auto-Life. Delta Attack = game over even with Auto-Life. And there are some other attacks. Get my point?

wakka is almost untouched and i have no plans to level him up now.

Wakka is guy with best Overdrive in game. You can use Tidus´es Blitz Ace but vs. Dark Bahamut (if you don´t have Sun Crest) you need Wakka´s Attack Reels (+ of yourse World´s Champion) or fight will be really long (i am talking about hours).

what does his ultimate weapon have?

Break Damage Limit + crappy slots but...
Celestial Weapons are same as standard customized weapons but... Celestial Weapons cause "celestial" damage and customized weapons cause normal damage. Example:
Tidus attributes = Strength 255, Luck 40
Normal weapon:
Blitz Ace damage is 12 000 (cca) x 9 + 80 000 (cca) x1 vs. Penance (no Protect)
Celestial Weapon:
Blitz Ace damage is 35 000 (cca) x 9 + 99 999 (cca) x1 (no Protect)

Make sure your wearing armor with Ribbon, Auto-Haste, Break HP - Limit and Auto Phoenix. You should use Quick Hit as well, its very useful.

I don´t follow you. Break HP Limit is glitch. You NEED to be killed with Dark Aeon´s attack in order to earn Overdrives fast. With Break HP Limit, it´s impossible. You don´t need to have full HP vs. them, Auto-Phoenix solves this. And think about situation how many turns you spend in order to heal guy with 35 000 HP for example. I had Wakka, Yuna, Tidus, Auron with 35 000 HP and it´s just crap. 9999 HP is perfect and enough.

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This question has being posted for a few months, but I'll just answer it anyway as it hasn't being answered<o:p></o:p>
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Firstly, any overdrive is usually crap against Dark Aeons (Blitz Ace and Attack Reel). The best bet is to just quick hit.
Secondly, you need break HP limit in order to kill Dark Bahamut, Yojimbo and Penance. Dark Yojimbo’s Wakizashi does over 10,000 damage to all your characters even with 255 Defence + Auto Protect. Bahamut and Penance for obvious reasons.
Third, overdrives is useful to kill monster arena monsters faster to get rare spear to up your stats. to get over drive faster, set your overdrive meter to comrade and have one really weak character in your team an just keep letting him/her die and Auto-Phoenix.
Forth, for healing, Rikku’s Final Elixir mix heal all your party for 99,999hp + 9,999 mp + revive them all from KO.

You could defend to cut the damage by 50% once more :p
And a guide I read claims the exact opposite, that any of the dark aeon's attack can be lowered to below 9999.