I found 2 bugs:
- The move fly uses 2 PP instead of 1, in a single round.
- On Route 35, just before the National Park there are 2 invisible planting soils.
Also, I can only switch between regions when I'm at certain locations of the map. For example, when I'm in Johto I need to fly to Indigo Plateau, then switch and fly again to Kanto.
See this images I uploaded:
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