Yeah the main problem here is how fucking fat you made the EVs to do it, like you don't really threaten anything else on the team with that kinda spread.
252 SpA Life Orb Sheer Force Nidoking Sludge Wave vs. 248 HP / 252+ SpD Assault Vest Mienshao: 107-126 (26.5 - 31.2%) -- guaranteed 4HKO
Mienshao gets Knock Off, which threatens Nidoking with the removal of its Life Orb, meaning it becomes neutered if it stays in and goes for Sludge Wave again. It also resists Stealth Rock, meaning it isn't prone to being worn down. Probably the best Nidoking counter you'll get, as there are no strange coverage moves that hit it specifically.
252+ SpA Life Orb Sheer Force Mew Sludge Wave vs. 0 HP / 252 SpD Assault Vest Mew: 129-152 (37.8 - 44.5%) -- guaranteed 3HKO
You can still dodge the 2hko and get some decent damage if you run 252 adamant instead of HP / Careful