>>23459015For me it has to stay true to the "bringing out all the potential" idea.
Which means that the Mega should expand on what the base form already does great. Not go in a completely different direction. However the design still needs to be creative to some extent.
Also, just adding spikes and shit like that is not generally very creative design, unless it's a big part of the base form. Like say with a potential Bisharp.
Bonus point if they include elements from past stages, like Mega Metagross regaining Metang's face, or Mega Salamence getting back more of Shelgon's armor.
