In addition to a huge library of regular trophies, Super Smash Bros. for Wii U will also feature unlockable Final Smash trophies. These beauties capture the action of the game in a way that normal trophies just can't, showing off your favorite characters at their most powerful. To unlock each Final Smash trophy, simply beat All-Star mode with a character, and you'll unlock his or hers.
Source: Super Smash Bros. Direct