I think the Mega Evolution is impossible in Fake 3D to resize correctly in 64x64 :P
I've tried Mega Charizard X in all ways without success (Mega Blastoise is not bad instead...). You can try M-Charizard X by your hands? I'm curious ^^
There are difficulties to edit a sprite large, they have some complex traits ...
The Xerneas, for example, is very strange, because it is only in a size that seems a little wood around other sprites!
What I really had in mind was to create a routine for two sprites arise
for some pokemon ...
Also, if applicable, create a type of camera handling (type Digimon World DS ...).
I even thought about doing something like ... I talk about pokemon BW approximation of the screen, but I can not enlarge the backgrownd (if anyone knows let me know please;-;), only the sprites move and do things like copies of them.
In conclusion, it would be possible to create two sprites - one complexed, and the other not!o_O
But do not worry about it, because the sprites will come out anyway, so it's a bit difficult to easily resize some ...
The Mega pokemon are starting to be edited, Mega Charizard X is ready!^^