Raptor Boost (ファルコンナックル, Farukon Nakkuru, Falcon Knuckle) is Captain Falcon's side special move. When used, Captain Falcon pauses for a split second before dashing a short distance forwards. If he hits an enemy, he proceeds to unleash a fiery uppercut, which pops opponents up into the air with below-average knockback. If Captain Falcon doesn't hit an enemy during the dash, he falls down and is easily punished - or even worse, if he falls off an edge, he immediately becomes helpless and is very likely to self-destruct.
When used in the air, the move changes from an uppercut to an overhand punch, acting as a meteor smash. Captain Falcon becomes helpless whether the move connects or not; as a result it is very risky to use in midair. In Melee, Captain Falcon's momemtum instantly halts when he hits an opponent, making the move difficult to survive using in any case. In Brawl, however, he bounces over the meteor smashed opponent and keeps a bit of sideways momemtum.
As the move doesn't deal any damage until it hits a target, it does very poorly at protecting Falcon from opposing attacks via clanking, leading to a reputation of low priority.
 Description from the Melee instruction booklet
Follow up a quick dash with a powerful uppercut that lifts enemies into the air.
 See also