Choice Band - Moxie
Lonely (+Atk -Def)
252 Atk 252 Spe 4 SpA
- Sucker Punch
- Heat Wave
- Brave Bird
He is an excellent late game sweeper. If you can get a revenge kill out of him you will hit like a truck, even when they resist you you will be able to take at a lot of their HP before they take you down. Moxie + Band + STAB skyrockets his Sucker Punch.
Of course you will need to switch if they use Substitute or try to build on you (unless you can 1hko even when they are at +6) but since this is an unusual build nobody will expect a Choice Band on him so people may not try to build on you. Is not hard to counter a Choice user, but he is quite effective when they dont expect it or when they ran out of counters.
Brave Bird, Superpower and Heat Wave allows you to use him as mixed revenge killer. Superpower and Heat Wave helps when you predict a switch (since Honchkrow is a steel magnet). Also, Moxie helps a lot when you are Choice locked into Superpower.
Competitive pokes who can resist after the first Moxie:
Ferrothorn 252/88: 32.7% - 38.6%
Forretress 252/4: 33.1% - 39%
Heatran 4/0: 35.5% - 42%
Tyranitar 0/0: 42.2% - 50.1%
Terrakion 4/0: 52.8% - 62%
Scizor 4/0: 55.3% - 65.6% (1hko with a second Moxie after SR)
Gliscor 252/184 +Def: 57.6% - 67.8% (1hko with a second Moxie after SR)
Breloom 4/0: 72.1% - 84.7% (1hko with a second Moxie)
Cloyster 4/0: 77.3% - 91.7% (1hko with a second Moxie)
Stuff that doesnt resist it (just so you get an idea):
Jirachi 4/0: 91.2% - 108.2%
Blissey 252/252: 1hko
+Spe as nature can counter Mamoswine (it outspeeds and 1HKO him) if you really wanna go that route. SR is gladly appreciated since it counters Dragonite, Sash and it puts Cloyter and Jirachi in the 1hko zone. Magnezone is a nice way to deal with his Steel problem. HP Ice can be used to counter a Gliscor switch if you predict it but Brave Bird gives you a nice way to revenge kill stuff you cant Sucker Punch. Sleep Talk can be used over Brave Bird if you really want a sleep absorber.