Strangely, despite the Wii hardware having its own friend list, Battle Revolution uses its own, independent friend list. Each game includes a unique 12-digit friend code, different from your Wii system number. To create a friend, both sides have to input the other's code. How you actually go about exchanging these codes is a mystery, as the information is not included on your battle pass. Once again, I presume Nintendo wants you to only exchange codes with your real life friends.
http://wii.ign.com/articles/750/750994p1.html
Pokemon nutzt eigene, 12-stellige Freundescodes...
(EDIT: Thema/Beitrag geändert)