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