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