I don't use many non-ubers...
But this Dugtrio set has to be the hardest set to get going:
Jolly 252 Spd/252 Attack
You have to completely rely on your opponent using a choiced Pokemon that uses an Electric move. Arena Trap keeps them in while you sub, Hone Claws, and then sweep. I love the set though. It's satisfying to see Duggy doing that.
Hyouki on PS