EVs: 252 Atk/252 Def/4 HP
NATURE: Brave (+Atk -Spd) if you're going with Payback/Adamant (+Atk -SpAtk) if you're going with Sucker Punch
Payback (deals double damage if you take damage first)/Sucker Punch Both deal with Psychic types.
Brick Break (your reliable STAB)
Ice Punch (works against Flying types)
Liquidation/Stomping Tantrum (coverage)
Honestly? I think Grapploct should have better stats than this. Its Attack is slightly underwhelming, and I did not expect its Defense to be relatively high. Also, its two abilities, Limber and Technician, don't really give you that much to work with. It also has WAY too many Fighting moves. Also, no coverage for Fairy types. So this is the best moveset available.