Medicham

Counter + Psychic and Ice Punch or Power-Up Punch

Counter is one of the best Fast Moves in the game, with strong damage output backed by STAB, along with above average energy generation. Ice Punch is commonly chosen for its lesser energy cost, as well as its valuable typing coverage, especially against Flying-type Pokemon. Psychic is a great coverage option that benefits from STAB to deal a lot of damage. Power-Up Punch is an alternative option to Ice Punch that sacrifices coverage for sweeping potential. Alternatively Dynamic Punch can be chosen if more Fighting-type damage is needed, but this gives up additional typing coverage. 

What about Psycho Cut?

Psycho Cut offers some of the worst damage output numbers among every fast move in the game, but in return ties for the second best energy generation (only behind Lock-On). This lets Medicham utilize its charge moves much more frequently, though it becomes much more reliant on them as a result. This also means that because of its poor damage output, finishing off low HP opponents might be more risky, due to the increased chances of them reaching their Charge Move prior to fainting.