Basically it has loads of weaknesses, but it's worth using it, I think! Snow Warning is great, let's see this set!
Amaura @ Eviolite / Icy Rock / Light Clay
Ability: Snow Warning
EVs: 60 HP / 220 SpA / 228 Spe
IVs: 0 Atk
- Aurora Veil
- Weather Ball / Blizzard
- Ancient Power
- Thunderbolt/ Dark Pulse / Earth Power
Aurora Veil works in Hail, set up by your ability halves damage from all oponents for 5 turns. Hail boosted with Icy Rock, Defenses boosted by Eviolite, or longer Aurora Veil thanks to Light Clay. Weather Ball or Blizzard for strong Ice STAB; Blizzard is a bit stronger, bypasses accuracy checks, but has lower PP, whereas Weather Ball can also adapt to other things like Rain Dance or Sunny Day, to change type for more coverage. Your choice though :). Ancient Power can be really good for Rock STAB, 10% OMNI boost. Thunderbolt, Dark Pulse, and Earth Power is a choice of Special coverage.
Have fun using this set, hope I helped! :D