For some reason when I try to quote you, Doctor_MG, my browsers have a memory leak.
So I will just quote you manually.
" Monster Hunter Generations Ultimate though? I mean, the remastered textures do great work hiding the very low quality assets and poly counts, but I would not say that it's overall better than Sun and Moon (except for maybe those god awful tree bark textures on Sun and Moon). I'll show you:"
I said MHGU is roughly comparable (not better, other than animation work) to Sword and Shield and does indeed have much better quality assets than Sun and Moon. You have a tendency to emphasize very close up images from cutscenes in Sword and Shield which have been polished by the developer precisely because they are a cutscene where the camera zooms in on the environment and therefore are more noticeable whereas the MHGU shots you select are from normal gameplay. But asset quality varies significantly in Sword and Shield. Most of the game doesn't look like the images you selected. Most of the time when you are playing the game you see this. 
or this
or this
Sword and Shield looks best in its cutscenes and in the turn-based, scripted battles.
Which is why I tend to talk about "average asset quality" rather than cherry-pick the few best looking assets found in either game.
You posted pictures of Colosseum but not Sun and Moon.
Here is XD Gale of Darkness, for example on Dolphin and without the distorted aspect ratio. 
Notice that the battles are in fully 3D environments and if you see them in motion the camera pans in all 360 degrees, unlike Sun and Moon which have 2d backdrops and the camera rarely rotates in a full circular motion. Also notice that the pokemon are proportioned properly in the GameCube games, whereas you have infamous instances like Wailord in Sun and Moon.
I personally think Sun and Moon has the better art-style (cel-shading works nicely in Pokemon games of that era) but technically its assets aren't all that impressive, even for a 3DS game.
