>>42554850My bad, I didn't realize only Smogon tournaments with like two dozen players matter, and nothing else. In that case may I suggest a proper answer, like Infiltrator Chandelure?
252 SpA Chandelure Flamethrower vs. 252 HP / 252+ SpD Corviknight: 254-302 (63.5 - 75.5%) -- guaranteed 2HKO after Leftovers recovery
+1 4 Atk Corviknight Brave Bird vs. 0 HP / 4 Def Chandelure: 187-222 (71.6 - 85%) -- guaranteed 2HKO
Please note that in this scenario I was very generous with Corviknight, maximizing its special bulk AND giving it +1 atk as it's hardly the best it can set up if there's a proper counter in the opposing team, and I didn't even give Chandelure an item OR using more powerful moves such as Fire Blast or Overheat.
You should also consider that Corviknight will rarely be at full HP since it will be using Substitute a lot, making that 2HKO a clean OHKO.
also u a faget