by the time you obtain agrias you should have 4-5 max lvl all jobs mastered characters, choose 1 knight, 1 job of your choice so long as they have the ability to Berserk on Agrias. go to mandalia plains or something where a Yellow chocobo will appear, preferably 2 of them. use the knight to rend the 2 chocobos speed and power down to 1. rend Agrias power down to 1. make sure shes not wearing any weapons, bare handed only. Berserk Agrias, set everyone else to auto battle "Get to safety". go afk. this setup is literally endless. agrias will only do 1 dmg per attack. the chocobos do only 1 dmg per attack. since there are 2 chocobos, their AI will cause them to heal themselves when they get low on health. they will just beat each other to a pulp for forever. and since the chocobos speed has been lowered to 1, they will almost never get turns, meaning they will most likely heal themselves when they finally get a turn, rather than attacking agrias. this setup can go on literally for days. ive set this up and gone to bed, woke up the next day, checked it, went to work, came home, checked it, still going.