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