Your Pokemon X/Y Thoughts (SPOILERS ALERT)

[Mass Distraction]

Can someone give me a clear and concise explanation of this whole mega evolution shabang. I see Mega Charizard X and Mega Charizard Y and I'm so very confuß.

Each Pokémon that has a mega evolution gets a stone that is specific to that Pokémon. The stones are held items and can be triggered when the player pleases (I think). Each mega evolution lasts until the end of battle unless the creature is knocked out. I'm assuming X and Y will have different mega evolutions so Mega Charizard X will look different compared to Mega Charizard Y. I don't think the way to obtain the stones has been mentioned and I don't know if the game specific evolutions will differ from each other in any other way than appearance. Oh, and each generation apart from the previous has mega forms.

That explain it?