Pokemon Battle Revolution is the first Japanese title to truly be "multi-player" and reports from IGN and other media folks in Japan are saying it has it's own 12-digit friends code. Console owners know that their hardware has its own "friends code" that's unique to the user. However, it seems only games that have DS interactivity require the extra 12 digit friends code. So essentially, the Wii has to pretend to have a DS-style friend code for that game only. It appears the friends code madness will continue on with the Wii. Source:
Digg