Okay, I have been experimenting with PokeSav (a program that generates AR Codes to change just about anything in the game you want to) and I have generated an AR code, I have copied it, but I don't know how to insert it into the AR Code Manager. How do I do it?
Level up my license! Yes my License! Click It to level it up and I'll level up yours if you have one!
open the AR code (duh)
copy the whole code (duh again)
go to the code manager and under pokemon diamond or pearl right-click it and click "new code"
name your code then paste the code in there!
(then click "ok")
and you got to update ur software too (to be able to put new codes in)
hoped that helped!