Keldeo to be revealed in upcoming CoroCoro
No method to allow players to legally obtain this Pokémon has been announced yet.
It is set to make its debut in the fifteenth film, now titled Kyurem VS the Sacred Swordsman: Keldeo, alongside Cobalion, Terrakion, and Virizion. These four Pokémon comprise the legendary musketeers.
CoroCoro also revealed some more information on the upcoming Nobunaga's Ambition crossover game, which will be released in Japan next month. In the scans, characters from the games are shown with their partner Pokémon.
<gallery> File:Keldeo CoroCoro Outline.jpg | A mysterious outline... File:Conquest March CoroCoro.jpg | Two-page Nobunaga scan <gallery>