Anticipation
Unnerve
Anticipation is pretty much a nerfed version of Forewarn, in that it can only reveal super-effective moves. With that in mind, most of the time CAP 2, with the obscene amount of weaknesses granted by the Grass typing, will see super effective moves that are standard on the opposing pokemon's set.
Unnerve seems like it would work well simply because of the flavor. It's a ghostly Venus Fly Trap, of course it's going to freak other pokemon out a little bit!
In my mind, every other ability on the slate is a competitive ability.