I was using the...Rangda, I believe they're called. The little penguin-y things that summon or -aga you. There's an area with a ton of them and they don't have a large respawn radius so you could just keep running in a large circle to fight them all. They're pretty easy to fight even without a preemptive strike and the CP is decent for the effort. I was grinding there for awhile after I discovered how much tougher Gran Pulse is compared to...everything up to that point, more or less.

~DragonHeart~