Drapion loves this. It already has a niche as an offensive utility poke, and a nice power boost suits it perfectly.
Drapion
Black Sludge
Ability: Battle Armor
EVs: 252 HP / 252 Atk / 4 SpDef
Adamant Nature
- Knock Off
- Poison Jab / Cross Poison
- Earthquake
- Taunt / Whirlwind
Knock Off replaces Crunch, messing with so many pokes it's hilarious. It doesn't knock off Mega stones, but at least it can scout for them: say, if your opponent has a Garchomp and a Tyranitar, and Knock Off doesn't get anything from Chomp, you know what the mega will be.
It last-resort checks Mega Gengar: Knock Off does a ton of damage (although it misses Crunch here), it resists its STABs and is neutral to all of its coverage moves. If it tries Sub/Disable shenanigans, switch to EQ and remind it of its Ground weakness.
Poison STAB is more useful this gen, physical in particular. I completely forgot about the existence of Cross Poison until I looked up Drapion's moves just now (it's a Poison Slash clone), but I guess that's viable. EQ is non-negotiable. It'll normally KO Blade forme Aegislash, and Drapion resists its Shadow Sneak too.
Dark/Ground/Poison gives decent coverage (Skarm aside, although you can get its Lefties), so support for the fourth slot. Taunt to mess with things, or Whirlwind. Toxic Spikes aren't too great anymore with Defog getting more common. Or lol Acupressure.