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