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