DISSIDIA FINAL FANTASY??????

In the last story in story mode, i have to beat (note their all at lvl110) kuja, grabranth, jecht, and ultimecia. Once I beat them i have to defeat a lvl 110 CHAOS with the left over health I had from the last fight. I definetly can't beat him with Sephiroth, Firion, warrior of light, Tidus, that little midget, kuja, bartz, zidane, the emperor, or that guy who is the warrior of light's enemy. He's to hard. even the people im best with I cant beat him with and of course their at lvl100. Someone hlp.