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