Honestly, i don't think the PSA moveset was generic or boring. I mean, it's hard to include in new effects, and it transmitted the essence of Waluigi pretty well.
When it comes to Smash Bros, each character needs a moveset that represents the character. Captain Falcon's moveset is flashy and manly, Luigi's moveset is awkwardly strong, and so on and so forth. Sometimes this works for clones . Let's say we have character X and character Y. Character X came first and character Y came later and took his moveset. This usually isn't much of a problem because character Y is usually similar enough to character X for both move sets to work. For instance, Falco could not have Luigi's moveset, in the same way that Mario could not have Fox's moveset. But Luigi's moveset can be similar to Mario's and Falco can have similar moves to Fox, because their movesets are fitting for the character and, despite having similar attacks, usually have enough tweaks to play in entirely different ways. Even characters with no resemblance such as Falcon and Ganon can have similar attacks but play in entirely different ways.
Waluigi is a different case. While it would be random if Peach and Bowser turned up using one-shot powers such as Bowser's rock summon move, we have to remember that Waluigi's powers are always changing. Purple vines, water creation, illusion creating, etc. All of these powers came right the **** out of nowhere ( like Waluigi) and they never stuck for more than one game. Maybe two or three, but that's it. For instance, Mario commonly uses fireballs or power-ups, Luigi's uses the Poltergust or variations of Mario's abilities, Peach will use hearts, Wario will fart or pull bombs and so on and so forth. Each character has abilities that originate from their own series, characteristics or even relations to other characters. Since Waluigi has no main games where he appears and his characteristics are random and crazy, Waluigi's powers and skills come out of the blue, so there isn't really an iconic ability for him to use.
In order to create a Waluigi moveset, we would have to use either sports skills or his random powers. Sports gear and moves are very generic since anyone could use them. Peach herself uses a racket and a golf club in her F-smash. If Smash Bros were to include Daisy, she would use either variations of Peach's moves or pull out sports gear, since Daisy has no powers or abilities beyond using Peach's heart moves with a flower aesthetic and that random crystal power in Strikers. If Waluigi were to ride a kart or a bike for the sake of replicating Wario's bike attack while referencing a sports move, it would have been awful in a lot of ways. I'm not saying Waluigi should not use sports or party gear. I believe that, if Waluigi were to use them, the moves that include them should have a characteristic of Waluigi. In my Waluigi moveset, I have included several sports moves. Some were pretty awful, such as the Gold Mantis f-smash. However, for the sake of this paragraph, take the f-smash where Waluigi uses his bat. It includes a Mario sports reference, but it includes characteristics of Waluigi and one of his own traits ( the more he charged, the weaker it got, but the reverse happened when sweetspotted), which makes this move singular to Waluigi. In my opinion, if Waluigi were to use sports gear, he should use iconic things he himself has, such as his purple tennis racket, his specialized bat, the Doctor Octopus-sequence machine in Mario Sports Mix, and etc.
As I have described above, Waluigi is different from the other characters in terms of powers and abilities because his are never consistent. I believe that his most iconic powers, such as air-swimming ( his most famous), tornado spins and vine creation, are definitive inclusion, while others such as the energy blasts, the teleports and illusion creating, should be taken with a grain of salt. I would prefer a moveset with these powers instead of a sports moveset. But it doesn't mean it's the best option.
I my opinion, if Waluigi were to get into Smash Bros, he should use a moveset that consisted of 4 things: his penchant for **** Dastardly tricks and machines ( sports gear), absurd powers and abilities (the special moves he uses) and things or attacks only Waluigi himself would do. And finally, he would need the same treatment that Falcon, R.O.B and Luigi got: obtain new powers that seemed like they always existed and were fitting with his play style and nature. That has happened to many characters before, and it definitively should happen to Waluigi if we were to transport the purple pest into Smash Bros. The PSA focused on attacks with his personality, SmashDaddy's MYM moveset focused on the sports gear and Golden's moveset focused on the special moves. My moveset sloppily attempted to include all 3 factors and it didn't work out as well as it could. Let's hope Nintendo takes these factors into consideration.
As a side-note, I will be incapable of making long ass posts like this one so oftenly, due to personal affairs. However, I will be soon posting my second Waluigi moveset, as a very very late April Fools joke. This moveset is inspired by the characters's memes, abilities he could use and things we discussed in this very thread.
