Hacking Action replay for DS

[mmarceau]

I bought my son the action replay for ds the other day at Best Buy. On the outside of the carton it says works on Pokemon Pearl and Diamond. He went in and picked a couple of cheats like unlimited pokeballs and things like that but it didn't work in his game. When he went to check in his bag and stuff(mind you I am the mom) he is nine and figures this out, the cheat didn't take. He did try it on other ds games like Spectrum and the cheats did take. Can it be used for these pokemon games?