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