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