Let me explain.
For those of you who remember Dragon Warrior of the early Nintendo days. It was the fourth game of the series. It broke down into 3-4 different heroes hence chapters in the final chapter everyone would meet in the same area/chapter or could meet up along the way and tag along. Band together to fight the "Team Plasma/Rocket" whatever. This wouldnt be a side or spin off series either. It would tie into current and past storylines. This would likely have to go on a wii system unless Game Freak can be magic genies and cram some thing like that in there.
As far as the badges and the moves I am not sure how that work out but I think it should be divided into three regions to make it a world thing Kanto, Sinnoh and Unova. It probably have to be skimmed version of them have a storyline of some terrible volcano blocks the path of some cities and so forth.
I know there are people that would like to see a "World" game, but i think this could be the closest thing to a world game one could get.
That is my idea. Perhaps people can add their own Ideas to this.
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