2. Mega-Evolutions
A new feature announced for Pokémon X and Y is the Mega-Evolution. This is an in battle only evolution, meaning that when a battle is over your Pokémon reverts to it's old state. In order to obtain Mega-Evolution, you must have a good relationship with your Pokémon, as well as having a stone for your Pokémon to hold that makes it evolve. Certain Pokémon such as Charizard and Mewtwo have a different Mega-evolution between X and Y, allowing for even more strategy to be used. Mega-Evolutions are great, because it also let's us see the old Pokémon we learned to love as kids in a whole new light, and the surprise we got from when our Pokémon evolved returns.