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