I think Azumarill takes this.
I actually feel like Contrary is actually kind of a nerf for Serperior in terms of peak threat level because it can't even use any of its varied boosting moves like Coil or Calm Mind even if it wanted to. In terms of moveset Serperior has literally no special options to hit Azumarill with other than Hyper Beam and Swift, and its physicals aren't that much more threatening.
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