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