I have an idea. We can:

-Burn this thread at the stake,
OR
-Have the game like this: Devan has come back (as if there was any other way to do this XP), and has lent his technology to Team Rocket in return for their servitude. Of course, you can expect Giovanni (Team Rocket leader) to pull a fast one on devan later...Jazz finds out about this and he and his siblings go to attack Devan, but he escapes to another galaxy. Jazz, Spaz, Lori and Eva (yes, she's a playable character! =D) follow him, but the entire system has been overrun by Devan's forces. Both the Pokémon Team Rocket stole and the planets' inhabitants have been changed into mutated slave monsters. To save the planets, our heroes have to find the ingrediants to reverse Devan's Mutation serum. There will be new moves, and you can free Pokémon from cages to have them assist you (like the Hip-Hops from JJ1). You can even transform into a Pokémon Anthro to do other stuff (like change into a water-type to swim underwater without worrying about air). It *MIGHT* be fun. Maybe.