Never destroy the negator untill u destroy the alot of the crawlers HP then if u have full OVERDRIVES on ALL the characters then use wakka use his overdrive to destroy nigator and hit crawler then use aroun(name right) then tidus,enemy turn,then switch wakka for kimari(name right)use his,attack with the other 2(always keep tidus and aorun)well u got the idea after kimari(name right)after his overdrive any order is fine.