right in your inventory of items do you have at least one level 3 sphere and at least one door to tomorrow? if so get Rikkus overdrive and mix them. now every attack or recovey item etc does 9999 hp damage or whatever!! so do like Tidas' slice and dice overdrive and lulu's black magic overdrive and items like lighting marbles/gems. just do things which attack more then once. tell me if you don't have any items etc and i'll tell you where to get them from!