Double-Edge Dance is an attack that can only be used by Roy in Super Smash Bros. Melee. It acts as his Side + B move, and is a very unique move. It can be combined with another of Roy's attacks, to make a combo attack. Roy will thrust his sword forward, to act as a long-range move. But, another one of Roy's attacks can be used the instant he finishes up. Roy will be able to do this up to four times in one combo, devastating the opponent in the process. However, the timing must be spot on, as rushing the attacks will result in just a weak sword slash. It is a more powerful version of Marth's Dancing Blade attack, except that it expels fire.
Interestingly, Roy will change colors once he uses this attack. The exact same happens to Marth when he uses Dancing Blade.