The Aura Trio (also known as the Yggdrasil Trio and Axis Trio by some) is a trio of Legendary Pokémon that originate in the Kalos region and comprises Zygarde, Xerneas and Yveltal. The three members are based on Yggdrasil, which is a huge tree in Norse cosmology. It is said to be protected by three guardians. A bird protects the upper part of the tree. A deer protects the soil of the tree. A snake protects the underground of the tree. The same is true for Xerneas, Yveltal and Zygarde.
|Fairy||Fairy Aura||Xerneas is the Fairy-type member of the trio. It is said to be the giver of life. It protects the soil of trees. It has a Calm nature and the ability to stop destruction. Its signature move is Geomancy.|
|Dark/||Dark Aura||Yveltal is the Dark/Flying-type member of the trio. Yveltal is the angry Pokémon and the sign of destruction. It protects the upper part of the tree. Its signature move is Oblivion Wing.|
|Dragon/Ground||Aura Break||Zygarde is the Dragon/Ground-type leader of the trio. Zygarde protects the environment and the underground of the tree. Its signature moves are Land's Wrath, Thousand Arrows, Thousand Waves and Core Enforcer.|
- Yveltal, unlike Xerneas and Zygarde, does not have a second forme. Xerneas has active and passive form, while Zygarde has the Cell, Core, 10% and 100%, alongside its 50% form.