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., Luigi Cyclone only hits twice, though both hitboxes are powerful, allowing for a total of 33%. In Super Smash Bros. Melee, both hitboxes are weakened, and the moves requires the aforementioned charge in order to travel distances. From Super Smash Bros. Brawl onwards, Luigi Cyclone doesn't need to be charged, though it is reworked into a multi-hitting attack.
In Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for 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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