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Neutral B - Bob-omb Toss - Takes out a Bob-omb and throws it. Before throwing it, the angle at which it is thrown can be changed. However, holding it for too long will make the Bob-omb explode, hurting Waluigi.
Side B - Sporty Switch - Waluigi switches between a tennis racket, a golf club/hockey stick (no difference between the 2), a baseball bat, a football/soccer ball (Like the one in Mario Strikers Charged. Like the ball in that game, it becomes stronger with every kick, and weaker when it isn't being kicked), and various balls made for throwing (Volleyball, dodgeball etc.), or nothing at all. This affects various moves.
Up B - Swimming Return/Twist Dunk - Waluigi swims through the air briefly. This move is better travelling horizontally than travelling vertically, and when holding a tennis racket, Waluigi follows up by hitting a ball at anyone in front of him. When wielding a basketball, Swimming Return becomes Twist Dunk. This move is better moving vertically than horizontally and is followed up by him slam dunking his basketball on any opponents beneath him.
Down B - Stomp - Waluigi repeatedly stomps on an opponent, which spikes in midair. When wielding a tennis racket, baseball bat or golf club/hockey stick, he follows it up with a powerful swing, with the tennis racket being quick and weak with short range, the golf club/hockey stick being the longest in range, dealing an average amount of damage and slower than the tennis racket, and the baseball bat, which is strong, but is slow and has medium range.
Final Smash - Bob-omb Bonanza - Waluigi starts by jumping offscreen, then returns wearing the 4-armed machine from Mario Sports Mix. He then starts throwing Bob-ombs onto the stage below him. He may sometimes throw an eggplant/aubergine that breaks shields and inverts the controls of those hit by it, and, depending on the Sporty Switch item he is currently using, he may even throw/kick a ball at the enemy or hit a ball at them. At the end of the Final Smash, he throws a large Bob-omb below him, which has twice the range of a normal Bob-omb. Afterwards, Waluigi goes back into the stage without his 4-armed device.
Up Smash - Waluigi does a single kick upwards, like Ganondorf's Up Smash, but weaker. He follows this up by doing a more powerful kick with his other leg that causes Waluigi to do a backflip. After performing this attack, Waluigi falls over. When wielding a football/soccer ball, he kicks that as well, providing him with extra range and a bit of extra damage.
Up tilt - Waluigi does a kick similar to Falcon and Ganondorf's up tilt, which buries opponents.
Side Smash - This attack depends entirely on what his Sporty Switch item currently is. If it is a tennis racket, golf club/hockey stick or baseball bat, he hits the opponent with it. (Don't think I need to go over the differences). If it's a football/soccer ball, he kicks the ball straight at the enemy. He may miss on a rare occasions, but the kick will be as strong as the ball. If it's a ball he can throw, he will lean back and throw it at an enemy. As weak as this one may be, it does have a good amount of knockback. If he has no Sporty Switch item, he does a drop kick instead.
Side tilt - Waluigi pulls out a potted piranha plant and lets it bite at the enemy. When using a tennis racket, golf club/hockey stick or baseball bat, he hits a ball towards his enemies instead, which can sometimes be replaced by a Bob-omb, Mr. Saturn or an eggplant/aubergine.
Down Smash - Waluigi stomps the ground once. This can either bury opponents or launch them a small distance into the air. If he is wielding a basketball, he instead jumps and slam dunks the ball into the ground in front of him, burying opponents. If it's any other ball he can throw, he spikes it into the ground in front of him, burying those that it hits. If it is a football/soccer ball, Waluigi simply kicks the ball under the opponent's legs, tripping them over.
Down tilt - Waluigi does a quick spinning kick that trips opponents over.
Neutral aerial - Waluigi spins around whilst bending his body to resemble the symbol on his hat. Due to the mini tornado around him, enemies and items are drawn towards him whilst performing the attack, and those hit are turned around. They are then pushed away when it ends. In addition, his falling speed briefly slows down. When using a tennis racket, he can hit a ball in front or behind him when the player tries to do a forward aerial or back aerial during the attack. This move is identical to Waluigi's Whirluigi ability.
Forward aerial - Waluigi does a single chop, like Luigi's forward aerial, but with a bit more range. When using a ball he can throw, he throws the ball instead.
Back aerial - Waluigi does a weak drop kick. Using a football/soccer ball increases the range.
Up aerial - Waluigi kicks upwards with both legs. Having a football/soccer ball equipped gives extra range.
Down aerial - Waluigi spins and quickly drills his way downwards, which can spike anyone below him. Like his neutral aerial, this draws in enemies and items, but does not turn enemies around or slow his fall. Instead, he goes straight down.
Floor attack - Does a kick similar to Mario and Luigi's down smash, which trips over enemies.
Edge attack - Slides onto the stage, tripping over anyone in his way. Does very little damage.
Jabs - When equipped with nothing, the first jab is a punch, the next is another punch, and the third one is a flurry of kicks, which finishes with a kick that launches the opponent. He simply attacks the opponent with his Sporty Switch item otherwise.
Dash - Waluigi creates a trail of thorns behind him whilst running twice as fast, which damages foes and creates a temporary platform for Waluigi. They only last a few seconds. Holding down the attack button creates more thorns.
Grab attack - Waluigi hits the enemy with his knee.
Forward throw - Waluigi either kicks the enemy away, throws them, or hits them with a tennis racket, baseball bat or golf club/hockey stick, depending on his Sporty Switch item.
Back throw - Waluigi kicks the enemy in their groin and flings them behind him with his leg.
Up throw - Waluigi either kicks or throws the enemy upwards, depending on his Sporty Switch item, and then throws a Bob-omb up with them.
Down throw - Waluigi stomps the enemy into the ground, then either hits them with a tennis racket, baseball bat or golf club/hockey stick or kicks them away, depending on his Sporty Switch item.
Intro option 1 - Rides a Bullet Bill onto the stage, then kicks it away.
Intro option 2 - Rides a kart onto the stage, then exits it.
Idle 1 - Grooms his moustache.
Idle 2 - Leans towards the enemy and does a "throat slice".
Taunt 1 - Does a short dance, then poses. His pose depends on his Sporty Switch item, and there are 3 for each.
Taunt 2 - Does his signature laugh, then insults his enemy. The insult is completely random.
Taunt 3 - Juggles a Bob-omb and an eggplant/aubergine, but drops them both. Enemies standing too close by will get hit by them.
Victory animation 1 - Waluigi does his Albatross animation from Mario Golf: Toadstool Tour.
Victory animation 2 - Waluigi pulls out a red rose and laughs.
Victory animation 3 - Waluigi drives around in a kart, holding a Bob-omb, but crashes the kart and causes the Bob-omb to detonate offscreen. He is blasted back onscreen and lands on his back, then sits up.
Well, there you have it.