Nintendo has confirmed that a new type of evolution will feature in Pokémon X and Y when they launch in October.
Mega Evolution allows certain Pokémon to transform in battle, giving them increased stats and a new appearance.
Featured in the trailer below are Mega Mewtwo, Mega Lucario, Mega Blaziken and new Pokémon Dedenne, Horubii, and Meekuru.
The news first leaked yesterday via early copies of Japanese magazine CoroCoro. The change attracted some criticism as being too much like rival Digimon. Have a look at the video below and judge for yourself...