Go to the top of the pokemon center. There are a few people who you can talk to for playing with friends. http://www.mindistortion.tv/iwantyoursoul/?i_am=danstakester
Chat with our AI personalities
You can trade, battle, and have voice chats with your friends over Wifi in Pokemon Diamond/Pearl, but to do so you need to know your friends' Friend Codes, and your friends need to know your Friend Code.
yes.
U can't
You don't. THAT'S HOw!!
Pokemon diamond