You know mr. jay. I think people think all about this question too. I mean, Ruby (Groudon), Sapphire (Kyogre), Emerald (Rayquaza) and Pearl (Palkia), Diamond (Dialga), Platinum (Giratina) and Black (Reshiram), White (Zekrom), Black 2 (Black-Kyurem), White 2 (White-Kyurem). It was pretty sure, that Game Freak will (probably one years or two) release Pokemon 'Z'. But like JarJar said Game Freak nor confrimed it yet, still a rumor. Only time will reveal it.