I agree with Amarillo. I don't think this deserves its own set, but it should be combined with Nasty Plot at the very least.
With Amoonguss around, a boosting grass-type that can't even hurt it at +2 doesn't sound very effective. Choice Specs shouldn't be mentioned, but a LO 4 attack set is probably more effective than the NP set in this meta. I still need to test it more before knowing for sure, but please test the set before rejecting it.