Instructions
Select "Add Friend Code" from the Start Menu. Add the Friend Code of the person with whom you will be trading. To view your own Friend Code, select "Confirm Friend Code."
Start the game and go to the Access Counter in the Digi-Coliseum.
Select "Digimon Matching With a Friend." Select your friend from the list.
Select "Trade Digimon" from the next menu.
Select the Digimon you wish to trade. You cannot trade Digimon that are currently in your party or in training.
Confirm the trade with your friend and accept. The traded Digimon is added to your party.