Talk:Mewtwo/@comment-4918670-20140513172147

Mega Evolution works as you need a Pokemon to hold a certain stone, you also need a Mega Ring  which you can get in on the way to the 3rd Gym Leader. You can only do it once a battle and on one pokemon

Mega Evolution buffs up the stats of pokemon, gives them new abilities of pokemon some times and even change the type

One example is Charizard holding a Charizardite X and when you megaevolve it, it becomes a fire and dragon type instead of fire/flying gives it the ability of Tough Claws which boosts the power of contact moves by 33%.and when it's holding a Charizardite Y it stays the same type, but gets the ability of Drought  which Turns the sunlight harsh when the Pokémon enters a battle like Groudon which does this as soon as it enters the battle.