The answer is no, but to be honest, you don't need to.
The Nintendo Wifi Connection cababilities within Super Smash Bros Brawl means that you don't have to connect Wii to Wii, but to have a LAN party you can have 2 Wii connect to the same access point. You don't even need to do that.
As far as I know, SSBB is only 4 player. And seems as 4 players can play on 1 Wii at a time, you don't need to connect 2 Wiis together, because it's only a 4 player game!!!