Help with Chac

[Hambone]

Can anybody tell me how to beat Chac? I have every dresshere except mascot and lady luck and my levels are, Yuna:74, Rikku:75, Paine:76.
I can Handle everything except stupid Heaven's Cataract. Thanks.

[Cruise Control]

CATNIP!!!!!!!!!!!!!

[Ohhh]

yes if in doubt CAT NIP!!
equip a gunner with cat nip, and while your hp is low, blast the fooker with trigger happy!!!!!!!! :D :D

[Directorate Jax]

Cat Nip doesn't seem to work for me. With level 76, 75, and 86 characters, and even with 9999 HP, Heaven's Cataract takes down all three of my characters in a single hit and it seems that I only have enough time for one Trigger Happy before Chac casts it. Of course, I've also tried using Auto-Life but it's difficult to get it on the characters before he decides to wipe out the group... And even if I do, I'm so busy reviving that I don't have time to use Gunner's attack. I tried the battle about thirty times in a row using various attack methods with no luck after which I called it quits, heh.