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