And I'll counterpoint the counterpoint.
"Viable" is the wrong word to use in your point about Ivysaur and Duck Hunt. Viable means they are able to work, which is what I'm in
favor of for them and not for a "true" quadruped.
The word you're looking for is "plausible", as that has to do with the
possibility rather than functionality.
As for plausibility, that's actually irrelevant to be honest.
It doesn't matter if Ivysaur was "lucky" or not nor does it matter that Duck Hunt wasn't given much discussion as that really changes
nothing about the point that they readily had workarounds (Ivysaur having vines and Duck Hunt incorporating a duck as well as the fact the dog
is capable of bipedalism) to function properly in not just how they fight, but how they can interact with
everything within Smash. If these workarounds weren't there, they wouldn't have been so "lucky".
Midday and Dusk are at a severe disadvantage in that regard with their designs.
Not
impossible? Agreed.
Not even that difficult? Heavily disagree.
Calling in
Thirdkoopa
here to give his input on the matter, but I will say my piece at least.
One can easily just think of ideas that sound good on a piece of paper or in text, but it's a different story when attempting to
execute said ideas. Angelglory gave a good example of this a while back when drafting a K. Rool moveset for his mod; some ideas he had for his moves just wouldn't work when actually trying to animate K. Rool doing them due to his design actively working
against being able to perform said moves.
This is where a lot of the concepts given to make a full quadruped like Midday/Dusk Lycanroc "function" in Smash fall flat from my perspective.
Sure, they
sound "decent" enough as easy solutions to basic problems, but they are
really hard to envision looking right in practice.