I used Wakka, Auron, and Tidus. I kept attacking the Negator with Wakka. I attacked the Crawler with my other guys. When the negator is dead I switch wakka with Lulu. I attack the Crawler with Lightning. When the Mana beam countdown gets near the end, I summon an Aeon and use sheild. Is that enough help? Oh can you make me a sig please?
