Pokémon fans will be given a special treat when they purchase advanced tickets for "Pokémon Movie XY: The Cocoon of Destruction and Diancie", which will be released in Japan on July 19. What is that special treat? The legendary Pokemon, Darkrai!

The Anime News Network reports that the "Pokemon Movie XY: The Cocoon of Destruction and Diancie" will play alongside the short film, "Pikachu, What's This Key For?"

Advanced ticket holders will have the opportunity to choose the most popular Pokémon out of the four in a special voting poll. As a bonus, ticket holders will be given a special gift code to enter into their Nintendo 3DS in order to unlock a Darkrai from the Pokémon X and Y game.

Darkrai is a Dark-type Legendary Pokémon whose techniques include Dark Hole, which puts opponents to sleep; Dream Eater, which restores Darkrai's HP; and Nightmare, which slowly decreases the opponent's HP.

The special prize is exclusively for theater audiences. Fans can purchase movie tickets starting April 19, and can obtain the special gift until September 30. In addition, the first 30,000 people who purchase their tickets in advance will also receive a Pokémon clear folder.

"Pokémon Movie XY: The Cocoon of Destruction and Diancie" will be shown on July 19. The film is set in a country called Diamond Ormpire, where the Holy Diamond resides as the country's source of energy. The country falls into chaos when the Legendary Jewel Pokémon, Diancie, loses her power to control it. As a result, Diancie seeks the help of Ash and his friends to restore the Holy Diamond.