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In short, I want the Pokemon equivalent of Sonic Generations.
>Game takes place in Kanto, ~20 years after Red & Blue
>New areas (such as waterfalls and snow north of Cerulean) and changes to old areas (such as the four routes surrounding Saffron becoming completely urbanized)
>Evil team fucks up and portals to other regions start popping up
>One portal per region, where you can visit a famous landmark from that region. The places where portals can be found is thematically linked to where you find them (e.g. A portal in Viridian leads to Lush Jungle, a portal in Mt. Moon leads to Mt. Coronet, etc)
>Due to foreign Pokemon streaming into these portals, all Pokemon can be caught
>Add in a number of new designs similar to a completely new generation, but with only a few completely new monster lines. That means there are dozens of new cross-gen evos (mostly focusing on Gens IV through VII) and Megas (Gens V through VII).