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