if youre having trouble, i suggest waiting for the mime materia with ribbon and if you dont have better armor use mystile. make sure cloud has his limit bar filled so you can use meteorain every battle. at the start i like to cast big guard before starting the limitless (rofl) meteors. then once u get enough for omnislash come back and do the same thing cept with omnislash to get w summon. sure u might die a couple of times if u get unlucky but not like losing reduces your points. just keep going. if you get bored, leave the ps on and go do something else for an hour.