Hmmmm, I just thought of something that I'm going to try when I get home... I'm starting to think I might be able to pull this off now that I think of this...

If I can use Aurons overdrive to eject the flamethrower from the battle I can use the weak shooters to my advantage and have them power up Rikku, Wakka, and Auron's overdrives again. This way, during the battle 2 I can have my 100 hp auron pull in rikku and use a strong mix like sunburst to win this battle. I'm not sure what's next but maybe I can pull it off now that I think of this... Well we'll just have to see! Man, maybe I should write a guide for this challenge if I complete it, no one else has written one yet =P