you have to go into the wifi place and if you succsessfully connect you get your code.
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get a pal pad and go to add friend
name Diamond code is 2406 8244 4855
Use your Pal pad(In key items), then select, then it will say(Whatever your name is)'s CODE. Thank you for reading this short paragraph.
Jo momma is
Depending on if you have gotten your Pal Pad yet determines when you can see your friend code. To get your pal pad, walk into any Pokemon center as long as you have your first badge and go to the basement. There a lady behind the counter will register you the item "Pal Pad." To see your code you must open up your items and go all the way to the key items pocket. Scroll down till you find pal pad then click register or use. Then click "My Friend Code" then vola! I hoped that helped. If not open up your Pokemon Platinum Instruction booklet that came with the game and see page 42. :] But you need to log on the Nintendo WFC and I dunno how to do that!!!