There are a number of places you can get this to happen in the Wild Area too. Even some dens can be used from different sides in different areas. I don't think it'll matter for legality until Gen 9 transfers happen.so im kinda not sure where to put this
i've had a sneasel spawn on route 8 and then chase me into circhester (the entrance, sorta) before i triggered the encounter with the sneasel. when i caught the sneasel the location shows as met in circhester
figured it was noteworthy enough to put this somewhere since there are no wild pokemon in circhester, so i guess this is probably only relevant for legality checks and shit?
didnt stop nintendo from banning level 36 bisharps though iirc lol