How do I play online in Pokemon diamond/pearl?
1Find a friend with a copy of Pokemon Diamond or Pearl and sit near each other. You do not have to be near a Wi-Fi hotspot if you are just battling or trading together. Both of you must turn on your DS, and then go into the local-battle mode to play against each other. Step2Go to a Wi-Fi hotspot with your DS and Pokemon game. Here, you can communicate with other Pokemon players around the world and challenge them to matches or just trade monsters. Ask for their friend codes to keep a record of your online Pokemon friends.