>>53938640- 2D game (let's go with FF1/2 PSP-style graphics).
- Have all the normal Pokémon available in one way or another (legendaries, mythicals, ultra beasts, paradoxmons, etc. either relevant to the overarching plot or as dlc).
- Multiple campaigns that scale to either pre or postgame levels and multiple paths that let you take gyms in multiple different orders (imagine gen 2, but the level curve is much higher since we don't need to assume a vast level plateau that Kanto had).
- HMs still exist, but you can tell Pokémon that can learn the move to use them without learning the move after obtaining a modification for an HM projection machine from each respective gym leader after beating him or her.
- Takes place in American Midwest, spanning everywhere between the Southwest of Kansas to the Northeast of Illinois, corner-to-corner (campaigns broken up between that area with various unique Pokémon throughout the land).
- Small teams broken up to work on different campaigns while artists create assets that mesh well with all the varied environments everyone will be working on.
- Pre-postgame: Typical Pokemon adventure with minor intervention from evil team.
- Postgame: Can start and fly to wherever you want in the region, trainers and wild Pokémon are postgame levels, still able to get a starter that you can slowly raise over the course of your new journey. Given gadget after first campaign that let's you encounter Pokemon as if it were pre or postgame.
- Endgame: Beat all X champions from all X regions then have a final battle with the evil team with lvl. 90+ Pokémon to fight. Head of the team uses at least 3 legendaries. (Credits either roll after every champion defeated and/or once the evil team is vanquished).
Even if most of it feels empty with very rough crossover between campaigns, I think it would still be really fun.