>>397918851. Contains all Pokemon, some locked behind post game
2. Multiple starting locations. Each location has a mix of Pokemon from different regions, but is generally balanced for types and follows usual patterns for early routes.
3. 3d and camera control.
4. Pokemon appear in the wild
5. Normal catching mechanics.
6. Any starter
7. Two rivals, encounter them alternating
8. Gyms can be done in any order, scale based on number of badges you have
9. most route trainers do as well but some areas are locked at certain difficulties.
10. Elite four, champion, you can accept challengers after you've won.
11. Battle frontier.
12. Most legendaries have special locations accessible after the elite four, with a few unique mons in those areas exclusively.
This was basically stream of consciousness, so I don't actually stand by any of it.