Yveltal is the dual-type Dark/Flying Destruction Pokémon. It, along with Xerneas, are Legendary Pokemon of Pokémon X and Y.
As a bird based Pokémon, it has huge flaps that are red colored internally and black colored externally .When Yveltal straightens its arms in flight, it forms the shape of a Y. This, along with the fact that Yveltal travels up and down, like the y axis, is why the game is called Pokémon Y.
Yveltal represents destruction, so it seems to be an angry Pokémon.
Yveltal is set for an anime appearance in M17 along with Xerneas and Diancie in the upcoming Pokemon X and Y movie.
Yveltal battled Xerneas and destroyed X and Y's hometown, Vaniville Town.
It can be only obtained in Pokemon Y in Team Flare HQ.
When this legendary Pokémon's wings and tail feathers spread wide and glow red, it absorbs the life force of living creatures.
When its life comes to an end, it absorbs the life energy of every living thing and turns into a cocoon once more.