[PXFIRE] Pixel Art!

[Suicune's Fire]

Questions! O:

a. Do we need to have been the ones to design the mega? Or could we, for instance, create a sprite version (from scratch obviously) of someone else's drawing/mega creation (giving credit of course)? (This would impact creativity though I'm guessing)
b. If we design the mega ourselves, can it be a previously designed mega that we make a sprite version of? Or do we have to design it specifically for this challenge?

Thanks! ^-^