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