Mach Tornado
Mach Tornado is the name of Meta Knight's Standard Special Move. When activated, Meta Knight spins at high speed, which slightly pulls nearby opponents towards him, then slashes them multiple times, as well as traps them, making escape via Directional Influence difficult. When the Tornado is finished, the last hit dealt causes slightly more than moderate knockback, but can be very deadly if used near the top of the screen. Mach Tornado can be controlled, by pressing left or right to move in that direction, and going upwards is done by pressing B rapidly, which also extends the amount of time Meta Knight spins.
As a recovery move, this is arguably Meta Knight's best recovery move; it all depends on position. If you are far under the stage but very near to it, then Drill Rush (angled upward) or Shuttle Loop is probably the better choice. However, if you are far away from the stage and under it (you can be almost magnified) then the Mach Tornado is the best choice providing you have at least 1 jump left. If you do, then using a jump before the tornado will allow you to gain more vertical height than if you were to start using the move whilst falling. Since it gains such a huge horizontal distance on top of a large vertical distance as well as being very high priority, this is one of the best recovery options in the game. However, something to note is that Meta Knight will bounce off of edges rather than grabbing them if he hits them while he is in the tornado. He also cannot grab edges during the first few frames of his falling animation out of the tornado.
Mach Tornado also has another use, of which is being able to destroy most projectiles it hits, save for a few of the larger projectiles and the Ice Climbers' Blizzard.
Control-wise, this move is like Kirby's "Tornado" ability that appears in many of the Kirby games. Rapidly pressing B will make him gain height. Meta Knight first used it in Kirby Super Star, where he transformed into a yellow tornado to attack.
