Things You'll Need
Instructions
Save your Pokemon game at a Pokemon Center and turn the game off.
Connect the e-Reader to the second GameBoy Advance. Connect both GameBoy Advance systems with the link cable. The link cable slot is at the top of the system, next to the cartridge slot.
Turn both GameBoy Advance systems on.
Scan the Celebi card into the e-Reader. Select "Mystery Gift" from the Pokemon game's menu and select "Receive Gift." Celebi will then be transferred to your PC in your Pokemon game.