First of all, thanks for doing this, spriters! I had no idea we had this many talented spriter artists in smogon, and it's awesome that you are sharing your talent to make competitive XY Pokemon possible. Many of these sprites are drool-inducing :F Big thanks to Layell for orchestrating this ambitious project!
I am no artist, but I do have some critiques for a handful of these sprites, though. Please consider them to hopefully improve on the current artwork:
Mega Charizard X - cannot make out the head / face clearly. No matter how big the Pokemon, Game Freak has always clearly drawn the face (see Palkia / Dialga)
Mega Blastoise - it has a really derpy face... The ears can be pointier / sharper, and its large brow straighter
Mega Pinsir - I'd rather avoid using pre-existing Pinsir poses to draw Mega Pinsir... it just doesn't work (esp if you're thinking of animating it). The feet needs to be worked on, as well as its outer shell (it's black on the inside, but the same brown on the exterior - the current design doesn't delineate this effectively). Noscium has a spectacular
Mega Pinsir, why not use that?
Mega Aerodactyl - same pose as Aerodactyl, which is off-putting - it looks so amateurish... I prefer Noscium's
Mega Aerodactyl
Mega Lucario - another casualty of using the same original sprite as a base - Mega Lucario have a slightly bigger torso and feet, and simply adding spikes and colors doesn't really work. It's also very difficult to see Mega Lucario's characteristically longer and red-tipped bangs(?)
Mega Garchomp - same issue as Lucario and the rest - Mega Garcomp has notably wider shoulders, and simply adding spikes onto BW Garchomp does not make it look like its mega form. It would look a lot better if Mega Garchomp is puffing out its chest than having its head stick out in front
Delphox - where's the wand stick?! Delphox not having its wand stick is equivalent to Alakazam without its spoon!
Pyroar - Its mane should have more volume - the mane is small in relative to the head. I prefer Noscium's Pyroar sprite.
Meowstick - you really can't tell that the ears are being pressed down
Malamar - The shade of purple is wrong - I would consider re-coloring it ;x
Xerneas - It must be a very awkward Pokemon to draw. The horns look abnormally off to the back of Xerneas's abnormally elongated head... maybe slightly shorten its neck so you have more space for the horns? Idk
Zygarde - You cannot make out the fine details of the membranes at the back. Again, I prefer Noscium's Zygarde's sprite, as it is much crisper and detailed.
These are the ones that stood out as the ones that needs revisions - everything else are really impressive work of art. Thank you all for your talents and contributions!
PS: Thanks for your response,
Layell - I stand corrected about certain aesthetic details. It's a shame we cannot make use of
Noscium's sprites, since it would have been a really nice replacement for Aerodactyl, Pinsir, Pyroar, and Zygarde