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