Yveltal is a large Pokémon with both avian and draconic traits. The back of its body is black with white spots along the wings and back; its front, head, and neck are bright red with branching, black lines throughout. It has a pointed, beak-like snout, bright blue eyes, a black, forward-curving horn over each eye, and a thin, antenna-like growth behind each eye. A feathery gray ruff encircles its neck and billows out over its back. Yveltal's wings each have three spikes along the bottom edge near the body and five large, black claws on the tip. It has small, birdlike legs with gray talons. Each foot has two toes facing forward and one pointing backward. Its tail is similar in structure to its wings, including the five claws on the tip.

Yveltal is said to represent destruction and death. It has the power to absorb life energy by spreading its wings and tailfeathers; according to legend, it does this in order to power up its own energy. It is highly feared by the ancient people of Kalos because of this. Yveltal is known to appear during a conflict, draining the life energy of any person or Pokémon that it encounters. Upon reaching the end of its lifespan, Yveltal steals the life energy of everything around it, then encases itself in a cocoon and falls into a deep slumber. Both and Yveltal are in charge of taking care of the land in a delicate balance between life and death. Yveltal's power can be used to power up machines, as seen with the ultimate weapon. Yveltal's light energy has the power to transform Evolution stones into Mega Stones when directed through the ultimate weapon. It can also release a red beam that absorbs its target's energy, restoring its vitality as a result. Said attack can also burn the ground it hits in the process. Yveltal can crawl on the ground using its wings and talons, similar to a bat. It can also use its wings to propel itself back into the air. It will harm anyone who tries to take it, even while it's in its dormant, cocoon-like state. Yveltal is drawn to the life energy that's released or disturbed within the ecosystem, such as the Mega Power emitted by the Ange machine. According to research done by of Team Flare, Yveltal's ability to manipulate life is considered so mysterious that not even science could successfully solve it.

As shown in Pokémon the Series, any living creatures drained by Yveltal will turn into petrified stone, though it is unknown whether this action is intentionally malicious or not. As depicted in Diancie and the Cocoon of Destruction (M17), Yveltal can be very vengeful to anyone who disturbs its sleep and will seek to destroy it. Its counterpart Xerneas has the power to cure Yveltal's victims by filling them with life energy, but as seen in The Legend of X, Y, and Z!, it couldn't undo 's case for unknown reasons. Xerneas is also shown to be capable of calming down Yveltal should it get enraged. In Sylveon Enchants (PS553), Yveltal was shown making plants wither away by simply touching them. In the Pokémon Adventures manga and in Pokémon the Series, it has been referred to as "Y", while in Pokémon Legends: Z-A, it is known as "the one who takes".

(Source: Bulbapedia)

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