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