>>44432370It’s unranked in NatDex OU. Even Skarmory has a rank in that format.
The only reason you would use Celesteela is because it’s a mix bulk Skarmory.
0 SpA Mew Thunderbolt vs. 252 HP / 0 SpD Corviknight: 148-176 (37 - 44%) -- guaranteed 3HKO
0 Atk Mew Thunder Punch vs. 252 HP / 252+ Def Corviknight: 76-90 (19 - 22.5%) -- possible 5HKO
0 SpA Mew Thunderbolt vs. 252 HP / 0 SpD Skarmory: 174-206 (52 - 61.6%) -- guaranteed 2HKO
0 Atk Mew Thunder Punch vs. 252 HP / 252+ Def Skarmory: 62-74 (18.5 - 22.1%) -- possible 5HKO
0 SpA Mew Thunderbolt vs. 248 HP / 0 SpD Celesteela: 128-152 (32.2 - 38.2%) -- 1.6% chance to 3HKO after Leftovers recovery
0 Atk Mew Thunder Punch vs. 248 HP / 252+ Def Celesteela: 78-92 (19.6 - 23.1%) -- possible 6HKO after Leftovers recovery
You are essentially using a Non-Roost Corviknight when using Celesteela
