Super Smash Bros. Brawl/Boss Battles

In the Boss Battles Mode you select a character and start fighting against every boss in a row. Like All-Star mode, you have one life and three hearts that fully refill you health after every battle. It also allows for Co-op, but once one person dies, the game is over (there are no continues). How to unlock
 * Finish The Subspace Emissary.

A list with every Subspace Emissary boss is here. Except for Tabuu, they will appear in a random order. Master Hand and Crazy Hand will appear in this mode as well.