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