Here's a set I've been working with over the last couple of weeks with reasonable success;
Pokemon Name: Honchkrow
Moveset Name: Tail Wind Sweeper (Mixed)
Move 1: Tail Wind
Move 2: Superpower
Move 3: Dark Pulse
Move 4: Sucker Punch/Pursuit/Brave Bird
Item: Life Orb
Ability: Super Luck/Insomnia
Nature(s): Naughty
EVs: Ordered 252Att/80SpAtt/176Spd
Moveset Explanation
Tail Wind: With a great mix of offensive stats, it's only really honchkrow's speed that's been holding it back from being a real monster. The new addition of Tail Wind goes some way to remedying this. With it's speed doubled for three turns, honchkrow can merrily take on the faster attackers that would normally come in to neutralise it.
Superpower: Superpower acts as the primary bludgeoning force behind 'Krow, capable of felling some of the best physical walls in UU with ease, going so far as to even managing the occasion 2HKO against standard 252HP/6Def regirock, the biggest defence stat in the tier, with the attack drop factored in.
Dark Pulse: Of the 15 pokes in UU with the highest Def stats, only four are resistant/immune to Superpower (Uxie, Slowbro, Weezing and Spiritomb). In comes STAB dark pulse, capable of garenteed 2HKOs on uxie and slowbro, a 2HKO on weezing with SR in play, and can manage a 3HKO on the most defensive of spiritomb sets (RestTalk varian, 252HP/160SpDef @Calm). Conversly, Superpower can scare the bejeezus out of any special tank in UU that isn't already scared by dark pulse, and the two together have almost perfect neutral coverage.
Sucker Punch/Pursuit/Brave Bird: The final slot is open for a variety of options. Sucker Punch defends against priority (Something a poke this fast is bound to attract) as well as providing a physical Dark STAB. Pursuit is great all-rounder, coming in third on the list of STAB-boosted users of the move. Finally Brave Bird is a hugely powerful STAB when not resisted, aswell as neatening up the coverage by hitting toxicroak (the only UU to resist the first two moves) for super effective damage. Drill Peck can also be used here if two types of recoil is off putting.
Item, Ability, EVs and Nature Explanation
Item: Being a typical sweeper, a life orb is a great option on Honchkrow. The recoil is not of much concern for a poke that is so defensively poor, while the significant boost in damage definately makes up for it.
Ability: Either ability can work with this set. Insomnia aids in switching in which is always handy, while the increased crit rate for the entire moveset is also very cool.
EVs: With superpower being Honchkrow's primary offensive option, max attack was a must (The most effective options for the final slot all happened to be physical too). The given speed EVs allow Honchkrow to hit 444 speed after Tail Wind, outspeed +natured base 85s with scarves and neutral natured base 95s with scarves. The final 80 EVs are bunged into SpAtt, which coincidentally garentee Honchkrow will 2HKO standard 252HP/6SpDef Uxie and Slowbro with lefties included.
Nature: A +Att nature was necersarry, a lot of KOs would be missed out on without it. From here I deemed a -SpDef nature would be marginally more efficient, since keeping the Def stat intact improves Honchkrow's chances of surviving the occasional weak ice shard- the only priority move that's super effective.
