I couldn't help but think this after hearing this song. I remember playing games like Pokemon Coliseum and Gale of Darkness when I was younger and loving the experience. I wish they'd make another one like it with today's technology and pokemon.
(And yes, I also really want the game to have a badass soundtrack)
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I think it would be fun having one that's an open world game. Depending on the sizes of the cities and towns they can either be included in the open world or they are their own area in the game.(Like the cities in Skyrim.) For the combat I think it would be fun playing as the Pokemon. The combat for that can be something similar to how it is in the show.