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Surprisingly decent counter against a good number of threats, three of them being Azumarril(and pretty much any other Fairy), Aegislash, and Greninja
Toxicroak @ Assault Vest
Ability: Dry Skin
EVs: 252 Atk, 252 SpD, 4 HP
Sucker Punch
Drain Punch
Knock Off/Fake Out/Ice Punch
Poison Jab
Toxicroak appreciates Knock Off more than the others, I find. And it gets a good amount of Special Defense after the investment and Assault Vest, Poison/Fighting is pretty solid as a special defensive typing when Psychics are held at bay.