Quoted By:
-Hi Jump Kick
-Psycho Cut/Zen Headbutt
-Ice Punch/Thunder Punch/Fire Punch
-Fire Punch/Thunder Punch/Rock Tomb/Bullet Punch/Drain Punch/Fake Out/Substitute
Hi Jump Kick is ridiculous and OHKOs nearly everything that doesn't resist it.
Psycho Cut/Zen Headbutt are for STAB but can also OHKO Mega Venusaur. Psycho Cut is a non-contact move, which is good for Cofagrigus and King's Shield Aegislash, and has a higher crit rate and more accuracy, but Zen Headbutt has a flinch chance and is slightly more powerful
Ice Punch is for Gliscor, Lando-T, Dragonite, Lati@s, bulky Garchomp, etc.
Without Thunder Punch you're walled by Slowbro and counted by Gyarados
Without Fire Punch you're countered by Aegislash
Rock Tomb is to hit any switch in with a speed drop, allowing you to outspeed and OHKO next turn
Bullet Punch for MUH PRIORITY
Drain Punch for healing
Fake Out for free damage and the turn you mega evolve, which fixes the 80 speed issue, but otherwise sucks because you need coverage
Substitute to prevent being checked
Overall:
To work well in OU or cartridge: HJK, Psycho Cut, Ice Punch, Thunder/Fire Punch
To roflstomp UU: HJK, Psycho Cut, Thunder Punch, Rock Tomb