Things You'll Need
Instructions
Plug the "Pokemon Diamond" cartridge into the Action Replay. Plug the Action Replay into the DS cartridge slot at the top of the Nintendo DS.
Turn on the Nintendo DS system and enter the following code at the Action Replay screen:
94000130 FCFF0000
B21C4D28 00000000
B0000004 00000000
00000DAC 03E70032
D2000000 00000000
Press the "Start" button to begin the game. Select your save file and press "A."
Press "Start" to open the "Options" menu and select "Items." You will now have 999 Rare Candies.