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