No. Think of them as two different games. You can't use super mario 64 ds codes in New Super Mario brothers.
No, each game version is unique and require differnet codes. if you need codes for Pokemon Diamond just Google it.
Pokemon white action replay codesnormally work on Pokemon white
It does work, but the codes are different for Diamond, Pearl, Platinum, HeartGold and SoulSilver, even the same codes. The codes are even different for other reigons such as Japan, Europe and America. So make sure you verified that closely. ~Lucario
Enter the codes in correctly... oK!
some codes u have to press buttons for them to work
No.
some times they do or sometimes it will just have a different code
AR codes do not work in B&W.
No, because things like apricorns aren't found in Diamond, besides the fact that the codes just wouldn't work being made for a specific game.
Unfortunately the Action Replay codes do not work for Platinum, but if you level up/catch rare Pokemon on Diamond/Pearl and trade them over (holding an item e.g. masterball) then it'll be like a little cheat device. This is how I intend to get Manaphy.
Action replay but can`t get the codes for u In diamond just surf for themy on the internet. The tell me if it work :) by my pkindigo username is yr07102 thank u
No They only work on Diamond