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