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