Luigi should wear the poltergust on his back and hold the nozzle with one hand.
Dash A: Same as in Melee
A: Punch just like in Melee
AA: Punch, then a smack with the vacuum nozzle
AAA: Punch, then a nozzle smack, then his pelvic thrust just like in Melee
Toward A: A kick just like in Melee
Smash A: Luigi twirls the nozzle around by the cord. Spins faster the longer you charge. When released he throws the nozzle forward. Then he reels the nozzle back into his hand by the cord. Similar in range and power like his Melee Smash, just looks a little more exciting.
Down A: Luigi tries to trip people up by grabbing the cord and swinging the nozzle at their feet.
Down Smash: Same as in Melee. Instead of using his hand to brace himself while he revolves his legs around the body, he uses the nozzle to suction to the floor. If Luigi used his down B move, then he uses a hand to brace himself. See below for Down B move.
Up A: A downcut similar to Melee except the nozzle is in his hand
Up Smash: Luigi looks up at the heavens and then faces his nozzle up with both hands. He switches the vacuum on and a gust of air shoots upwards. If the oppenent gets caught in the gust near the nozzle, they start to spin around in a circle (similar to when an oppenent gets caught in Mewtwo's confusion). Very little damage, but good at keeping a foe airborne.
B (Ghost Shot): Instead of shooting a green fireball, Luigi fires a random colored ghost out of his vacuum. The "heart" of the ghost is a burning ball that looks similar to Luigi's old fireball and is the same size. Only by hitting the "heart" of the ghost will the oppenent be hurt. The ghost fades as quickly as the old fireball. Basically the same attack, but with different visuals.
Toward B (Green Missle): Same thing with the Misfire. But Luigi uses his vacuum as a means of propulsion. Quickly spins around, assumes a sitting position and releases a gust of wind in the opposite direction he is going. Hits oppenent with his rear.
Down B (Debris Shield): Luigi sucks up parts of the floor that create a shield on the nozzle which stays in place due to the suction. By pressing down B again Luigi shakes the nozzle so the shield breaks off. Any move using the nozzle of his vacuum will do about 6 percent more damage and have more knockback. The cost of this attack is that Luigi cannot use his throws, his green missle, Up Smash or ghost shot while the nozzle is clogged. If Luigi stays still, a projectile will break the shield but the green man will take no damage, much like how Link uses his Hyrulian shield.
Up B (Jump): Same as his original Jump. Goes diagnal like Mario's. Bonus if oppenent is hit straight on.
Grabs:
Luigi sucks his oppenents in. The distance is similar to Samus's grapple hook, but if the enemy is in the further half of the suction he or she still has a chance of running away. But there is less lag after then Samus's throw. The oppenent disappears inside the bag.
A: Luigi grabs the cord of his nozzle and starts backwhipping the bag strapped on his shoulders.
Toward: The oppenent comes out of the bag, but now their butt is stuck to the nozzle and their arms wave about. Luigi can run back and forth like DK in this position but cannot jump. A press of A will cause him to shoot them slightly forward, nowhere near as far as DK's forward throw.
Up: Luigi points the nozzle up and fires the oppenent upwards along with three ghosts that revolve around them briefly before fading. Jumping through a ghost causes a small increase in percentage.
Backwards: Luigi tucks the nozzle backwards under his armpit and fires his oppenent behind him. Similar in distance to his old backthrow.
Downwards: Luigi spins in place wildly like his old Down B, with the nozzle pointing in all directions as it spins too. The person is fired in a random direction.
Aerials: The aerials are the same as in Melee. Except the toward A instead of being a karate chop, now uses the nozzle to attack instead.