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