>>47386568252+ Atk Huge Power Dusknoir Poltergeist (110 BP) vs. 252 HP / 80 Def Ferrothorn: 244-288 (69.3 - 81.8%) -- guaranteed 2HKO after Leftovers recovery
252+ Atk Huge Power Dusknoir Earthquake vs. 252 HP / 252+ Def Toxapex: 214-252 (70.3 - 82.8%) -- guaranteed 2HKO
252+ Atk Huge Power Dusknoir Shadow Sneak vs. 0 HP / 0 Def Dragapult: 306-360 (96.5 - 113.5%) -- 75% chance to OHKO
I'm liking these calcs. Kinda fucked by sucker punch users, Rillaboom, and pretty much anything that can outspeed and OHKO it due to its horrible speed and HP, but if you can support it properly it would be a beast. 252+ attack and 252 HP are best for it I believe. I'd say OU or very viable UUBL.