0237 Hitmontop

Counter is easily one of the best moves on PVP with 4 DPT (Damage Per Turn) and 3.5 EPT (Energy Per Turn). On top of that, Hitmontop gains STAB from the move to boost it even farther.

Triple Axel is tied with Close Combat for being Hitmontop's cheapest Charged Attack. It also offers valuable anti Flying coverage while boosting Hitmontop's Attack. Stone Edge can provide additional coverage to certain Pokemon not covered by Triple Axel. Close Combat does not provide type coverage, but it has incredible DPE and can burst down opponents who might expect Hitmontop's other Charged Attacks.

Has STAB counter and isn't horribly fragile. Check. It can absolutely wreck a number of hugely powerful Pokemon in the meta such as Galarian Stunfisk, Registeel, Lickitung, Bastiodon, and Umbreon without breaking a sweat and Stone Edge can even help provide coverage against its checks. Check. The fatal flaw for this Pokemon is the existence of Medicham, who has better power, typing, moves, and coverage to the point of shaping the Great League meta. If you need a mon that can COUNTER Steel and Dark types, Hitmontop can do the job.

Hitmontop can reach near Ultra League's CP cap, which allows it to be viable there. It benefits from Medicham not being viable here, but it still has to contend with other powerful Fighting-type options such as Cobalion, Virizion, and Poliwrath. Having access to Triple Axel can give it a few edges over the other Fighting-type options, however.

Hitmontop has no utility in the Master League.