Things You'll Need
Instructions
 
Plug a Nintendo Action Replay DSi into a Nintendo DS, and connect the DS to a computer via a universal serial bus (USB) port. 
Open the Notepad software program on your computer. Notepad is included with Microsoft Windows operating systems. Copy and then paste the following into a Notepad file: 
94000130 fcff0000 
62111880 00000000 
b2111880 00000000 
d5000000 03840011 
c0000000 00000025 
d6000000 00000b74 
d4000000 00000001 
d2000000 00000000 
Click on the "File" menu button that is at the top of the Notepad window. A list of options will appear. Click on "Save As" in the list of options, and save the information you copied and pasted as an .xml file. You may name the file whatever you want. Save the file to your computer's desktop. 
Click on your computer's desktop, highlight the .xml file you saved and then right-click on the file. A window displaying various options will display. Click on "Copy" in the options that displayed. 
Open the Code Manager software that came with your Action Replay DSi. Right-click the column on the left side of Code Manager, and select "Paste." That will place the code in your Action Replay DSi. 
Close the Code Manager, and then disconnect Action Replay DSi from your computer. 
Click on the house logo on your Nintendo DS' screen to return to the main screen. 
Click on the green, star-shaped "Start" button on your Nintendo DS' main screen. A list of items will display. 
Scroll down the list of items to the .xml file you saved, and click on that file. 
Start your "Pokemon: SoulSilver" game. Once your press both the "L" and "R" buttons on your Nintendo DS, 999 rare candies will deposit in your inventory in the game.