In all his games, Wario is a brawns over brains kinda guy. And as such, I think his moveset should reflect that along with the... Somewhat odd nature of his.
Wario (when serious) is a real powerhouse, whether punching, stomping, throwing, or piledriving enemies into oblivion. Therefore his gimmick would be him being able to charge almost all of his attacks. His last hit in a combo, tilts, throwing opponents, and of course his smashes.
Wario's charging animation starts off like normal with him winding up, but like in Wario World once he goes past a certain point, he'll start to glow with a golden yellow aura signifying he's going beyond a average person's limit.
v.Tilt- Wario now does a shorter version of his old Down Smash.
Dash- Wario does his forward flip from Wario World. It works similar to Little Mac's >.Special, except he's only invincible from the point that he jumps to when he reaches the highest point of his jump. So it can become predictable if over used.
v.Air- Wario free-falls quickly in a ground pound attack that meteor smashes his opponents.
-Pummel and Throws-
Pummel- Wario shakes his his opponent roughly, like in Shake It.
^.Throw- Wario does the Pile Diver from Wario World.
>.Throw- Wario now throws his opponents with one hand like in Wario Land.
>.Smash- Similar to his original, but this time he'll dash a bit forwards. The more you charge, the further you go. With the max range of 6.ft.
v.Smash- Wario uses his Earthquake Punch from Shake It. His punch itself has little range, but it creates a shockwave that stuns opponents based on how much you charge it, and the opponent's dmg%.
N.Special Inhale- Wario inhales nearby opponents. It has shorter range then Kirby and Dedede's inhale, but Wario can walk around (although very slowly). Once he catches a opponent the attack acts like his old N.Special.
^.Special Corkscrew Conk- Wario now uses his Corkscrew Conk from Wario World. The move is exactly the same, but with a different animation: https://www.youtube.com/watch?v=9VQlsTdUFSA
>.Special Spicy Sprint- Wario eats a flaming hot pepper, then he catches fire. Similar to spicy curry, except rather then breath fire his body catches on fire and he deals damage by running into opponents. He runs slightly faster then his motorcycle would go, and by pressing B again while running he'll overheat and become a ball of fire that deals much more damage and knockback at the price of also taking damage himself.
v.Special Fat Flop- Wario scarfs down a comically large donut and expands to 2x his normal size (but doesn't get taller) and weight. While in this state he is much harder to knock around and deals damage by simply landing on opponents and using aerial attacks. However his speed and jumo height are cut in half. It last for 2.sec and if used in the air, he'll immediately fall and damage any opponents underneath himself.
-Final Smash- Same.