Tips fighting dark aeons:
Have auto haste or regen with as many characters as possible. Both if you can. All characters should also have ribbon, and don't make yuna good with wht magic and such make all characters have powerful stats as possible. Have one character healing all rounds. Specifically with dark yojimbo. once his overdrive becomes max summon cause you aint gonna survive zanmato now matter how strong you are and it dispels stuff like auto-life.
Have fun.
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