Topic summary
Mega Evolution

Extracted from the Wikipedia article Pokémon X and Y.
Story
Continuing their journey, the player encounters the villainous Team Flare, whose goals at first seem to be geared towards making money off of Pokémon. Later encounters with Team Flare reveal their true goal to be the annihilation of humanity to return the world to a pristine, more beautiful state. In Shalour City, the player learns how to use Mega Evolution from the Mega Evolution guru Gurkinn and his granddaughter Korrina, who is the Shalour City Gym Leader. Defeating Korrina in a special Mega Evolution battle using Lucario, the player is given the ability to freely use Mega Evolution. The player then continues their journey, defeating Gym Leaders and stopping various schemes carried out by Team Flare. In the Lumiose Badlands, the player defeats Team Flare during their attempt to steal energy from the region's power plant and restores power to all of Lumiose City. Once the player obtains their seventh Gym Badge, they, and the rest of Kalos, are addressed by Lysandre through the Holo Caster (a holographic communication device); Lysandre informs them of the fact that he is the Team Flare boss and intends to destroy humanity.