it lets you battle a specific group of people online called your friends
No!
yes
get a pal pad and go to add friend
You talk to your friends, online or in person, and ask for them.
you can get the friend code if you entered the Pokemon center. go upstairs and voila talk to the 3 girls.
they the codes your friends give you so you can have a wi-fi battle with them or trade pokemon
No. You need codes and a friend who has pearl. (and Pokemon ranger) or YOU could have Pokemon pearl and Pokemon ranger not just your friends.
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.
go to the underground floor in any poke centre. (you have to get your first badge)
the website my friend and i use is called cheatcodes.com it has a LOT of cheats on it
This Question Violates the WikiAnswers Rules. NO POSTING FRIEND CODES
email me at tresamourasm@gmail.com and we can exchange friend codes. :3