Yveltal

Yveltal is a Legendary Pokémon introduced in Pokémon X and Y, part of a legendary trio with Xerneas and Zygarde that has roots in Norse mythology. At Junichi Masuda's request the shape of a Y framed its box-art design. For the first time, Ken Sugimori did not design the generation's legendaries alone, bringing in Atsuko Nishida to help with Xerneas and Yveltal.