A Cloaking Device is an item in Super Smash Bros. Melee that makes the user invisible, though movement subtly reveals their position with slight flickering and visible edges. Damage is not dealt while a character is invisible, but knockback still applies, meaning invisible characters can still be KO'd. While invisible, each opponent KO'd will add points for an Invisible KO bonus. The invisibility lasts 10 seconds. Slippy hints in one event match that the Cloaking Device is of his own invention, however, the trophy and look of the device makes reference to Perfect Dark.
If you wish to benefit from the damage resistance while not losing track of yourself, use names.
Cloaking Device and Computers
When the cloaking device is used, the character is invisible to other players to some extent. However, computer-controlled characters are not affected by the Cloaking Device and continue fighting as if the opponent was not cloaked at all.
In Super Smash Bros. Brawl
In Super Smash Bros. Brawl's Special Brawl mode, a modifier named "Clear" is available. Turning this option on makes all characters invisible, similar to the effect caused through use of the Cloaking Device. The Cloaking Device itself, however, does not return in Brawl for undetermined reasons.
Additionally, in Co-Op Event 6: Unwanted Suitors, the opponents will be invisible in the same way.
Similar to when the Nintendog is summoned, Name labels will also be hidden during clear Brawl.