The Henne Mines. Go to the area where you have to switch on the lever and a bunch of Abysteels appear when you do. Equip shields and stuff to be able to survive. While there, set the Gambits to Undead -> Sleepga and Sleep -> Curaja. You should be dealing damage to all Abysteels with Curaja. Don't forget to set Gambits to heal yourself, too. They are very powerful, but once you get the hang of it, you should be able to constantly win.
After you win, go two areas away, and then come back. Pull the lever again to release the Abysteels again.
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