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