From the Super Mario Wiki
Luigi Cyclone is Luigi's down special move in the Super Smash Bros. series. When used, Luigi will spin around in a similar fashion to Mario's Mario Tornado. Luigi pulls in nearby opponents, spin them around, and fling them in the air. This move is best used when surrounded, because of it's lack of effect on a single opponent. Also, Luigi Cyclone can move faster than Mario Tornado, making it ideal if characters are far from Luigi. In all five games, Luigi can rise with it, if the special attack button is pressed repeatedly, although it has to be charged on the ground first in Melee.
In Super Smash Bros. for Nintendo 3DS / Wii U, Luigi Cyclone can be changed into one of the two custom variants, although they are locked by default. The first one is Mach Cyclone, which pops Luigi into the air, making his recovery better. The other one is Clothesline Cyclone, which has increased knockback, at the cost of his ability to trap opponents.
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