I just beat my first Dark aeon ^_^ it was only Ifrit but more will follow.

I'm power levelling as much as i can and have auron with almost all his stats maxed out (exept luck :S)

I don't plan on getting the magus sisters or anima... what i want to know is, is it possible to defeat dark anima and everything there after without them?

And anything else i should learn or need to know for the upcoming battles? Will i need anyones ultimate weapons? I have aurons but everyone elses is simply customised