From SmashWiki, the Super Smash Bros. wiki
The
Down Special Move, (also commonly referred to as
Down B in iterations prior to
Super Smash Bros. Brawl) is a
special move performed by pressing the special move button while holding down on the
control stick (or control pad on the
Wii Remote). These moves are often gimmick moves, like reflectors or absorbers, or moves with unique properties when used in different ways, like how a falcon kick sends him downwards when used in the air, or Meta Knight can teleport and choose to attack if he wishes. They also usually include minimal character movement.
[edit] List of moves