If you have trouble with snover might i suggest porygon.
Evs 236 HP / 196 Def / 76 SDef
Nature: Calm
Move 1: Tri Attack
Move 2: Thunder wave
Move 3: Shadow ball
Move 4: Recover
Trait: Trace
Item: Eviolite
Porygon is 3koed by blizzard and can just t-wave it making it useless the rest of the match so you don't have to worry about it. It also checks sub roost krow effectively. Trace works wonders too copying abilities such as prankster, flash fire, and etc