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