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