Subconscious error, my bad. Damn, I was just in the 'More Villains' thread the other day arguing why the impending "You got Mewtwo, so shut up about no new villains" talking point was stupid, too.
I see.
Mewtwo was basically portrayed as a villain in Melee, and it was because a villainous Mewtwo appeared in a movie at the time. Keep in mind, Pokemon individually are races essentially. They can be good or bad. Mewtwo in Melee was based on the villainous Mewtwo from the original movie, and the final event match was clearly a "villain" battle... Ganondorf, Mewtwo, and (Giga) Bowser. Mewtwo was fully intended to be portrayed as a villain in Melee. Now, yes, its arguable if Mewtwo in general is a villain, but he's the closest Pokemon has to a villain as far as Smash representation goes.
Thing is, Mewtwo wasn't even a "villain" in his own movie.
Except for the dub, but that was 4Kids taking Mewtwo's complex character and story and turning it into "I hate humans. I'm going to kill all humans. Oh, and all Pokémon that aren't clones that I have created."
He may have been the designated antagonist, but he wasn't a villain by any stretch.
Wolf and Dedede are in a similar boat, as is Wario. Which is also why people cry for REAL villain representation. I do consider all of them (including Mewtwo) villain reps, but they're not all inherently 100% villains. The only 100% villain(s) in Smash Bros. to date is... Ganondorf. That's it. Bowser is closer, since he is a villain in most incarnations, but... well, there's a trope called "Go Karting With Bowser" for a reason.
There are
villains which the likes of Bowser and Ganondorf are, and then there are
anti-heroes which Wolf, Wario, and Dedede are.
Wolf, like Fox, is a mercenary. The only difference is that Wolf doesn't care about whether the ones that hire him are good or evil; he only cares about getting paid. Though by Assault, he's actively trying to clear his name and is willing to take on threats to the Lylat System.
Wario started off as a villain until Wario Land 2, when he became more of a neutral force that does what he wants and is willing to help someone or stop something evil if it benefits him. And then a greedy boss of a video game company.
Dedede.......is just a jerk. A jerk with (most of the time) good intentions behind his actions when not being possessed by Dark Matter or some other entity, but still a jerk. Not a villain.
Whereas King K. Rool and Ridley are ALWAYS villains. The sole exception for K. Rool is in a non-canon Mario spinoff game, and even there he's still antagonistic towards DK at first, and begrudgingly joins DK's team because he's impressed with their skills. Guess he wasn't as interested in fighting DK in that game. Even in Barrel Blast (which barely has a plot, if any), the Kremlings are clearly portrayed as being antagonistic towards the Kongs.
It's not a matter whether they're "always" being villainous or not; you're either a villain or not.
K. Rool and Ridley are characters that are villains.
Same with Ganondorf and Bowser, regardless of Bowser putting aside his villainy for a game of tennis or a kart race from time to time.
As stated before, Wolf, Wario, and Dedede aren't villains. They may have had villainous
debuts, but they've quickly went the route of anti-hero.
Mewtwo on the other hand....is just a savage beast of battle. Hippos aren't "evil" or "villainous" just because they are highly aggressive creatures that attack and kill anything unprovoked, are they? No. So why should a
fictional highly aggressive creature be considered as such?