The area outside the forest where you find Ramuh. You will fight either two black flames and a stone Golem which a simple Ramuh summon will dispose of. Or you will fight 5 black flames which again are killed with a simple Ramuh Summon. You get 2AP for the Golem fight and 3AP for the Black flames.

If your having that much trouble with him, you can break an elemental rod. That will very nearly kill him. Or you can use your new summon Titan as he's the strongest one you have at this point (requires summon level 3 to use)