>>50493423Hatterene live in the Glimwood Tangle, but you can't find or catch one there (only Hattrem); the only places in the wild where they come out are the Lake of Outrage and Crown Tundra. The implications being that they generally avoid the gyms and people if there's too many things around, but in areas that are wide-open and less lively, they're more comfortable being out in view. They'll still teleport away though. Kanto/Johto/Hoenn/Sinnoh would probably be pretty comfortable for them, though for the latter they'd probably only want to be in the more isolated fringes of the land. Unova would be awful for them due to high density, noise pollution and
americans. Kalos would be fine, she would just need to have help with or stay away from Lumiose City, but the region itself is very quiet and pretty and has nice towns.
Alola would probably annoy the living hell out of her though, since they'd be constantly coming up to her and doing the rainbow greeting and all the in-your-face with no personal space would make her freak out.
Galar is ironically probably the worst region introduced for Hatterene to live in, outside of the Crown Tundra (which is it's own separate place anyways), because it's not just filled with screeching sports fans and giant stadiums but their habitats are getting smaller and they're forced to deal with the giant maybe-holograms that would be impossible not to see, much less hear. It's no surprise that Galar describes them are near psychotic when their patience finally snaps.