Honchkrow is a very underrated Pokemon in my eyes. It has a big sweeping potential in OU, with access to STAB Priority Sucker Punch and STAB Brave Bird. Coupled with a solid base 125 attack and Moxie, this thing can sheer through unprepared teams and be nearly unstoppable. The set I run for Honchkrow is:
Honchkrow @ Life Orb
Ability: Moxie
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Substitute
- Brave Bird
- Sucker Punch
- Roost
This set has been doing what it needs to most of the battles I've had with it. The strategy is simple, try to get behind a Sub as they have a weakned Pokemon that switches out in fear of you getting the +1 attack boost from Moxie. From here you can Brave Bird to potentially do massive damage, and if it doesnt OHKO them, you can usually just Sucker Punch them the next turn. It could be that they would send out a Roar-user and try to get you out off the field, but Honchkrow is faster than a good amount of the Roar-users, so it shouldn't be the biggest concern. Sending out Honchkrow late-game could be a good idea. A lot of weakened Pokemon could easily be OHKO'd by a Sucker Punch, or at least a +1 Sucker Punch/Brave Bird after you have got that Moxie boost into work. The whole point of this set is to force them to switch and then finish off the Pokemon that switches in, and then continue on with a sweep. You could also Roost your health up, once the Life Orb damage/Brave Bird recoil makes its health go to crucial levels. The Sub forces the opponent to attack you unless they have Roar and etc., while Sucker Punch will grant you +1 priority to attack them before they get to do anything to you. Once you have taken out one Pokemon and got the Moxie-boost it is basically just to sweep the opponent. I would advice you to give this set a try, or at least the Big Boss Pokemon Honchkrow a shot in OU.
Note: Sticky Web-support could make this set even more reliable and make Honchkrow an even bigger threat.