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"4x weakness to poison is not good"
Yeah, neither is Salamence's 4x weakness to Ice. Lets go over Whimsicott's weaknesses (except Doublade, who outright will always beat Whimsicott)
Poison: Mega Beedrill - A paralyzed Beedrill is basically a kill
Nidos - Encores after switching in on any non...
Okay, so maybe not the best, but definitely the most versatile. Also, Whimsicott isn't supposed to sweep teams, but yes he does dictate the flow very consistently. Opponents must always be wary of his presence, sort of like Magic Bouncers.
Whimsicott from A to A+
This thing is a monster. Two of the best stabs in the game, a trolly 116 speed and prankster? This guy destroys setup sweepers and paralyzes common switch ins such as Crobat and Cobalion with Stun Spore. It eats knock offs, has relatively good staying power with...