"I have to admit that without the clones, it would have not been a victory." -Obi-Wan Kenobi
It was revealed that Game Freak has disabled Restore Points in the upcoming Virtual Console versions of Pokemon Red, Blue and Yellow.
Restore Points allows the user to save their current state at any time. In the case of Pokemon Red, Blue and Yellow, users could exploit that system to endlessly clone their Pokemon.
It was also revealed that you can't backup your Pokemon Red, Blue and Yellow save files, because that system would too allow the user to clone their Pokemon.
Image credit: Nintendo