Pokémon Black Version, Pokémon White Version, Pokémon Black Version 2, and Pokémon White Version 2 were developed to be compatible with systems in the Nintendo DS family, while Pokémon X, Pokémon Y, Pokémon Omega Ruby, Pokémon Alpha Sapphire, Pokémon Sun, Pokémon Moon, Pokémon Ultra Sun, and Pokémon Ultra Moon were developed exclusively for the Nintendo 3DS family of systems. Due to differences in the functionality and specifications of the two families, including their communications systems, it is not possible to carry out communications directly between software designed for the two different families.
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