Pokémon save files as of Black and White are at a respectable 4MB. X and Y should be double that. That throws storage out of the equation.
Eh, I still say that this is because people might accidentally save over each other's save, which means endless bickering and a world of pain for the one whose file got saved over.

I WON A BET AGAINST AZUREN! WOOOOOOOOOOAAAAAAAAHHHHHHHHHHHHHHHHHHH
:3







