Heres the rundown on Sobek
Pop Items: Bloodstained Bugard Fang, Gnarled Lizard Nail, Molted Peiste Skin (Only the Bugard Fang needs to be farmed from the NM. The other two are obtainable from Gold Pryxis in Abyssea Misareaux.
Drops: Sobek Skin - X , Kamome , Skogul Lance , Stone of Balance (War, Blm, Blu, Pup, Nin) +2 leg upgrade , Card of Balance (Whm, Drg, Smn, Cor, Dnc) +2 leg upgrade , Stone of Ardor (War, Brd, Pld, Nin, Blu) +2 body upgrade , Card of Ardor (Bst, Drg, Sch, Mnk, Whm) +2 chest upgrade
Atma: Atma of the Gnarled Horn - Counter +10% - Crit Hit Rate +20% - AGI +50