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