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