they the codes your friends give you so you can have a wi-fi battle with them or trade pokemon
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get a pal pad and go to add friend
yeah
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.
You can find the codes for that on supercheats.com or gamespot
Hi! You can get them on youtube.com or go on Google.com and type in What are some action replay codes for Pokemon diamond? Or type in action replay codes for Pokemon diamond and one more Pokemon diamond action replay codes. And there are some websites like neoseeker.com will probley pop up and they will have ALOT of codes! Hope this helped ;-)