I've found that Weavile can be pretty anti-meta in OU, where a lot teams have no physical wall other than Gliscor. It can OHKO Starmie, Celebi, Virizion, and most dragons. While Thundurus was OU, it was a great counter, and it still works great against Tornadus as long as it doesn't use Tailwind first.
I'm Weavile's #1 hater but I have to admit that its a decent SD sweeper.
Weavile @ Life Orb
Jolly
252 Attack / 252 Speed / 4 Defense
Swords Dance
Ice Shard
Night Slash
Low Kick
vs..
Tyranitar: Low Kick OHKOs and Scarftar is slower.
Rotom W: Takes 69.1% - 81.6% from +2 Night Slash.
Scizor: Decimates Weavile, though Low Kick does 39.1% - 46.1%.
Ferrothorn: +2 Low Kick easily OHKOs.
Dragonite: +2 Ice Shard OHKOs even through multiscale.
Politoed: Specs and sp def are OHKOed while some scarfers are outrun.
Gliscor: OHKOed by +2 Ice Shard no matter what.
Heatran: OHKOed by Low Kick after Stealth Rock, outruns Modest Scarf.
Jirachi: Sp def takes 69.3% - 81.7% from +2 Night Slash.
Latios: +2 Ice Shard OHKOs as does +0 Night Slash.
Skarmory: Beats you senseless unless you run Ice Punch, which 2HKOs at +2.
Reuniclus: OHKOed by +2 Night Slash.
Deoxys S: OHKOed by Night Slash, takes 72.2% - 85.1% from +2 Ice Shard.
Haxorus: OHKOed by +2 Ice Shard.
Ninetales: +2 Night Slash OHKOs 252 HP tales.
Conkledurr: yeah, no chance here unless its at around 45%, in which case +2 Shard KOs.
Celebi: +2 Night Slash OHKOs.
Forretress: +2 Low Kick 2HKOs so you win unless it runs Gyro Ball.
Terrakion: Low Kick OHKOs.
Gyarados: +1 Night Slash OHKOs after Stealth Rocks.
Gengar: +2 Ice Shard OHKOs after Stealth Rocks.
Starmie: Night Slash easily OHKOs.
Landorus: +0 Ice Shard OHKOs.
Jellicent: +2 Night Slash OHKOs.
Infernape: +2 Low Kick OHKOs, just be careful of Mach Punch.
Volcarona: +2 Night Slash OHKOs.
Tentacruel: Only max / max Tentacruel can survive +2 Night Slash after Stealth Rocks and it doesn't even OHKO back.
Gastrodon: +2 Night Slash OHKOs.
Magnezone: Low Kick OHKOs and you outrun the scarfer.
Espeon: Night Slash OHKOs.
Blissey: +2 Low Kick usually OHKOs after Stealth Rocks.
Salamence: +1 Ice Shard easily OHKOs.
Hydreigon: +2 Ice Shard OHKOs.
Breloom: +2 Ice Shard OHKOs.
Vaporeon: +2 Night Slash 2HKOs while Vaporeon can not OHKO back.
Latias: +2 Ice Shard OHKOs it after Stealth Rocks, +0 Night Slash also can OHKO after rocks.
Toxicroak: +2 Ice Shard does 74.6% - 87.9%.
Lucario: Low Kick easily OHKOs though Vacuum Wave OHKOs and Extremespeed does a ton.
Bronzong: Low Kick does 64.8% - 76.3% to the standard set. It needs Gyro Ball to KO back.
Virizion: +2 Ice Shard OHKOs.
Scrafty: +2 Low Kick OHKOs.
Venusaur: +2 Ice Shard OHKOs.
Metagross: +2 Night Slash does 61% - 72.5%.
Mienshao: +2 Ice SHard OHKOs.
Cloyster: +2 Low Kick OHKOs.
Swampert: +2 Night Slash 2HKOs and Swampert can't OHKO back without Hammer Arm.
Mew: +2 Night Slash OHKOs.
So basically pair Weavile with a Magnezone and find a way to Swords Dance and you should be able to sweep without much effort.