Things You'll Need
Instructions
Connect an Action Replay card to a computer via the USB cable that came with the device.
Start the "Action Replay Code Manager" software that came with the device. The software allows you to manage all the game's and codes present on the device.
Right-click in the "My Codelists" panel and click "Add new cheat." A small window will appear.
Type a name for the cheat and enter the following Celebi Action Reply Code in the box:
94000130 fffb0000
d5000000 000000fb
b21c4d28 00000000
b0000004 00000000
c0000000 0000000b
d7000000 00024620
dc000000 00000006
d2000000 0000000
Press "OK" to save the code to your Action Replay device.
Connect the Action Replay device to a Nintendo DS handheld console and start a saved game of "Pokemon SoulSilver."
Travel to Viridan Forest. This is one of the final areas unlocked in the game.
Hold the "Select" button and walk into any area where you can battle wild Pokemon in the area, such as tall grass. Celebi will appear, and you will have the opportunity to catch the Pokemon. If you fail at catching the Pokemon, you can repeat this step as many times as you need.