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