Where to Find and Catch Snover
From Pokemon Go Wiki
Snover are found and captured in Nest and Habitat locations.
Nests
Snover Nests are locations that consistently spawn Snover.
Habitats
Snover Habitats are spawn locations where Snover is likely to be encountered, but not guaranteed the way a Nest is.
Additional Tips and Information
Best Nests
If you know a really good nest or any of the nests above is really good, list them here: