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