ok go to the place where u fight milida the 2nd time when u beat her go back therre in a random battle. u can see there are 3 bodies of water and alot of hills. in this battle there are usally chocobos and dragons and panthers and goblins. first have evryone master the squire abilitly accumulate set that to ability slot 2. then u can change to the class u wqant all the jp to go to.go and beat all the guys leaveing a panther or a dragon left. have all of your guys go into the pool of water with the rock in the middle.there keep useiong accumulate till u have enough jp points all u like remember panthers cant enter water or dragons cant ether so ur safe in the pool so keep useing accumulate and when ur done go smash that panther or dragon with a 999 hit at lv 20.thats what i did
if u have any other hints post em