About Pokemon, there’s a studio (Crema) who made a Pokemon-like game called Temtem. Different mechanics (stamina instead of PP, 2vs2 instead of 1vs1 etc). I’m in my second playthrough and I can guarantee there are going to be plenty more. I’d check that out.
I don’t know which prefecture is attached to the flag but third row, last one to the right, the clover-like one.
Edit; it’s the Miyagi prefecture.