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