Not sure if this idea has been asked before here.
But I think Nintendo and Gamefreak should combine all Pokemon gens in one game. Whether this game would be on the Wii U or 3DS. It would not matter to me. If MS can put 4 Halos on one game, then I think all pokemons should be done. It would be ridiculous value and tons of playtime. Not only that but you can catch them all from their respective games, to truly complete the collection.
Maybe some extra ui to keep track of everything. I think it would be best on Wii U, but Gamefreak might not want to mess with home consoles. Maybe 3DS can handle all the generations.
What do you think?