Aila was a character that appeared in Pokémon the Series: XYZ.
3,000 years ago, Jan told Aila that he will find Yveltal at any cost. As things got worse, Yveltal appeared in front of Aila and brought destruction to Jan's Kingdom. Jan battles Yveltal but his Talonflame got petrified. As Yveltal is prepared to petrify Jan, Aila sacrificed her life to save him thus being petrified in the process rendering him unconscious. After Jan wakes up, he saw Aila petrified and mourned for her death. After the destruction of Jan's Kingdom, Xerneas in its tree form transforms into its deer-like form and Jan pleaded Xerneas bring Aila back to life before it hops away. When Jan gets older, Xerneas shares its life energy to revive the forest before leaving, Aila however cannot be restored to life. Jan passed away after meeting a young girl and telling her about Xerneas, Yveltal and Zygarde.