Yveltal (Japanese: イベルタル,Iberuraru) is a new Pokémon that is a Legendary Pokémon to be released in Pokémon X and Y. It is unclear what type of Pokémon it is but it may be based on a Wyvern. When it arms itself in flight, it looks like the letter "Y", hence the title of the game.
Its name may be derived from "Quetzal", an Aztec deity/god. Its appearance, however, shares traits with wyverns, as it is believed the two legendaries are based on Norse myths.
Trivia
Yveltal is the fourth Pokemon to start with a Y, the others being Yanma, Yanmega, and Yamask.
Yveltal is the first Legendary Pokemon to start with "Y".
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