Sure, catalogue already contains Mega wishlist: the thread, but it has next to no potential for hosting considerable amount of artwork for hypothetical Megavolutions and/or design-centric discussion.

Mega evo art - be it straight from the highest shelf or from refridgerator door of an impressionable 12-year old - this is the place to post it.

Pic related - concept for a Mega-Gallade that was originally submitted to /vp/ and then redrawn on request.