i dont Know i tried doing it when i got the game i do not know why they are not working sorry :)
Enter the codes in correctly... oK!
AR codes do not work in B&W.
there are no ar codes out for white yet but in about 3 months form 2day (apirl 8, 2011) im sure they'll be some codes
I HIGHLY doubt Pokemon Pearl AR cheat codes will work in Pokemon Platinum =]
your answer and more for AR codes... @ Neoseeker.com
i would mainly want codes for legendary Pokemon not items and stuff
The game is a Fire Red hack, so Pokemon Fire Red codes will work.
the action replay for the sp has awsome encounter codes
Just go to supercheats, and they have tons and all work.
AR codes work by manually putting a code on or download it(depending which AR you have)
if you find a website about Pokemon platinum AR codes email me at landonmeador@gmail.com
if you have an AR for the gba