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