I actually wrote up a theoretical Waluigi moveset. Holla at me.
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Color 1: Default
Color 2: Inverted, black clothes with purple jeans
Color 3: Luigi styled
Color 4: Wario styled
Color 5: Brown clothes with faded blue jeans
Color 6: Black clothes with green jeans
Intro: Waluigi drives onto the stage in his kart
A: Open handed slap, fast startup makes it good for getting out of close range with the combo
AA: Wrestling style back chop, think Ric Flair
AAA: Lunging jab
FA: Long ranged yakuza kick making use of Waluigi's lanky limbs
DA: Waluigi hoists himself up with one arm to stretch his legs at his opponent for a low kick
UA: Waluigi swats at the air above him
Fsmash: Waluigi raises his arms and performs a Mongolian chop directly in front of him
Dsmash: A breakdancing type kick, like something you'd see in Mario DDR
Usmash: Waluigi swings a baseball bat/gold club/tennis racket (random) upwards
Throw Attack: Waluigi grips the opponent by the collar and stomps on their fot
FThrow: Waluigi kicks the victim like a soccer ball
Bthrow: Waluigi swings the victim around and tosses them into the air, catching them with a superkick in midair
Dthrow: Waluigi tosses the victim into the dirt and stomps on them like his assist trophy attack
Uthrow: Waluigi throws the victim directly upward and tosses a bob omb at them, sending them flying
B Special - Sports Mix: Waluigi throws either a golf ball, a baseball or a tennis ball into the air, and swings at it with the respective equipment. The golf ball has minimal damage, but is the fastest and travels the furthest. The baseball is a fairly standard projectile with solid damage. The tennis ball bounces off surfaces and does average damage. Occasionally, Waluigi will strikes a blue shell, which hits very hard for high damage and knockback like Luigi's jump punch.
FB Special - Batter Up: Waluigi swings his bat. If it connects with a projectile, it will fire a flaming baseball at the opponent for high damage and a burn state. Can also be used to get incoming opponents off Waluigi.
UB Special - Slam Dunk: Waluigi hops into the air and tosses a basketball downwards. The basketball bounces off the ground and other surfaces as long as it has momentum. The damage and knockback are greatest on startup.
DB Special - Kick Off: Waluigi drops a soccer ball and punts it into the air. Pretty much the inverse of the above.
Final Smash - Perilous Pinball: Waluigi puts his hands on his hips and laughs in a theatrically over the top fashion as lit bob ombs start raining from the sky. Additionally, pinball bumpers appear on the stage. After becoming active, Waluigi can throw bombs, items, or his ball specials off the bumpers to give them momentum.
Taunts
U: Waluigi leans down with one hand on his knee and the other pointing to his face, daring the opponent to attack.
D: Waluigi puts his hands on his hips and laughs
S: Waluigi rubs his hands together sneakily and snickers
Victory
1: Waluigi points to himself with his thumbs, from Strikers
2: Waluigi performs his Strikers crotch chops and says "WA-LU-I-GI YEAH YEAH YEAH!"
3: Waluigi juggles a bob omb in one hand while snickering and grinning
4.Waluigi sits in the seat of his kart and yawns with his legs stretched out