Mr. Internet. check this http://wii.ign.com/articles/707/707504p1.html
"Even better, the game will be fully online playable in addition to featuring a robust multiplayer mode. "My plan is to include Wi-Fi connection compatibility and online functionality. One of the primary reasons Super Smash Bros. Brawl was created was that Nintendo, when taking Wii online, wanted to have Smash Bros. to do that," added Sakurai."