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Pokémon Diamond and Pearl are capable of using the Wi-Fi functionality of the Nintendo DS, which allows players to connect over the Internet. As with other games, you must get the Friend Code of your opponents before being able to connect.
You can battle, trade Pokémon and use the internal microphone to talk over Wi-Fi in Diamond and Pearl. This functionality can be accessed via the Pokémon Wi-Fi Club, which is located in the previously revealed Pokémon Center basement.