The story in Pokemon Grape is original where it takes place in 1999. You have to impersonate a baseball player who has to participate in a competition. The winner of this competition will end up owning the Pokemon League. By the way, this will also avoid a war between the Frejo and Kelgo Regions, whatever that means. You have to build up your team of Pokemon before the competition begins to save the day. On top of that, former members of Team Rocket from Kanto have made it their mission to give you hell.