I reiterate: They only promised an October release, not simultaneous; they'll be able to cobble together most if not all of the Pokedex easily if they're released even a week apart.
But if that's a big deal to you, could just, y'know, not check Bulbapedia or Serebii or what have you. --- Creator of Jay's Journey (see quote!) "It's not ten years old! Therefore, it sucks!" - Nostalgia whores everywhere