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