>>54820088A game where you play it as a protag in a nonspecific time or region where time and space are getting messed with. You work with Celebi and Hoopa going through different places in the history of the franchise. You can pick any region at any time, but, pokemon that were found in their specific region/time/space can only remain there due to them being in the same graphics as the game they were from. Ofc the gba-ds games will all be sytlized 3D to look like the old sprites, and the towns will be the same but it will be in 3D(RBY games being sprite looking but 3D). The games plot and villians have a similar vibe to UsUm where they're all there with a final confontation against a villian behind the scenes pulling all the strings. You travel the regions to fix what's happened to them being that the villian is going back in time/forward in time and helping out the villians from the previous games carryout their plans, which would end up in a final confrontation against each baddie(Giovanni,Maxie/Archie,Cyrus,etc.) Each would be given an extra gimmic from a game they didn't have before or a super powered legendary to compensate for you having known the previous games and what they would typically have (eg. Giovanni in RBY would have Mewtwo with access to 4 Zmoves, giving you only 2 pokemon that aren't 1 shotted to fight him).
This probably sounds stupid and will be lost to all who read it, but it's the only way to really make an *All regions* pokemon game.
There would also be a super secret super boss battle against Wes from Colosseum where he snagged all the baddies best pokemon and you'd have to grind it out to take him down, (eg. Mewtwo W/4Zmoves, Ultra Gigantimax Necrozma, Mega Arceus, etc..) 
