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