So far I've just been using a standard mixed Smash set, with enough speed to outpseed Scarf Rotom-W. Smash, Power Whip, Shadow Ball, HP Ground. Works very effectively, as i have numerous counters to Skarm on my team as is.
(20:14:18) Soulwind: your rainstall is better than pussy
Achievements: 1 on DW (SM) 3x, 3 on DW (PO), Page 1 on Smogon WiFi, 1 on Smogon LC, 1 on PBC DW, page 1 Ubers on top 6 servers, 1 on Beta Ubers, 4 on Showdown Ubers, 47-0 win streak Smogon DW.