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