Hi Hiromosa, welcome to our wonderful community! Enjoy your stay and have fun! ^^
Once you earn four badges, go to the port city of your region (Castelia, 2nd dock left) and either go to Kanto or Hoenn.
- All your Pokemon will be transferred to PC.
- Your Unova key items and HMs will disappear until you return to prevent cheating.
- If you have less than four badges and want to return back to your default region, talk to your mom.