Where to Find and Catch Abomasnow
From Pokemon Go Wiki
Abomasnow are found and captured in Nest and Habitat locations.
Nests
Abomasnow Nests are locations that consistently spawn Abomasnow.
Habitats
Abomasnow Habitats are spawn locations where Abomasnow 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: