I know i'm late, but I saw an interesting skarm set on pokemon online.
I'm not sure about evs or nature, though.
Skarmory @ leftovers
Ability: Breakable Armor
-Drill Peck
-Swords Dance
-Guard Swap
-Whirlwind/Rock Slide/whatever
it looks stupid, but it worked once (on me lol) so I felt like mentioning it.
Set up an unexpected swords dance as your opponent hopefully hits you with a few physical moves, lowering defense but increasing speed because of breakable armor. Now that your very quick, use guard swap to saddle your defensive stat drops on your opponent, leaving you with +2 attack, +1 or 2 speed, and good defenses, while your opponent is left with a few defense drops, leaving you to do some damage with drill peck. Great to bring in on conkeldurr, who usually trys for a few bulk ups thinking you can do nothing but whirlwind, until you nab his defense boosts with guard swap and murder his team =)