So... online co-op is a no-no? Really now? It's been done a hundred times already... even on Nintendo's servers, remember BW2?
Think they mean party mode. Team up as in joining together in a private lobby or something, and then looking for a game with a group of people you want to be placed on the same team with. Hopefully at least, I highly doubt Nintendo would not allow an online co-op mode.
PSN: LawnGnome93, Want: Golden Sun DD, AC Brotherhood http://oi55.tinypic.com/28i00n8.jpg