Interesting idea...
I'd call it the Tsuchi Region, because I see it as a more earthy, rural region, and tsuchi means earth (like the ground under our feet) in Japanese (idk I just love Japanese words). The region itself is inhabited by a feudal, medieval-style population. The region's society was released from a reign of darkness when a legendary Pokemon trainer (unnamed) rose up, with the help of Arceus, and drove the forces of evil away from that region. This trainer was then unanimously selected by his people to rule over them in the form of a new kingdom.
The people there are extremely family-oriented, but many still venture off and become trainers. There is a large community of powerful, strong-willed trainers there that are constantly fighting to see who's the best. In general, people are very kind and love to follow their dreams. Most people tend to treat total strangers as family, creating strong relationships between many people.
____________________________________________________________________________________
Hope you like this idea, can't wait to see what other people can think up!
See you around,
Midnight :)