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