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