Well, if you can't stand these guys, there is a way for you to like level up REALLY quickly. GO out of Song of Nephilim, and go into the U-Tic Battle Ship simulator (Not the Ziggy one), the one that Junior raided. In there, keep going straight until you reach a place which has a lot of rooms in it. GO to the recond room, and a guy will be standing there. His name is Ace Pilot. He won't attack you unless you approach him and get into a battle.

In the battle he will be easy until he gets into his AGWS (He is easy in that too IMO). And if you have trouble with killing him, get Erde Kaiser. You can nfight this guy as many times as you want.