Xerneas, Yveltal, and Zygarde are a trio of Legendary Pokémon first discovered in the Kalos region. Xerneas and Yveltal are the game mascots of Pokémon X and Y. Xerneas and Yveltal represent life and destruction, respectively, while Zygarde is said to monitor the balance of the ecosystem and reveal its power when the ecosystem is disrupted. Xerneas has the power to share eternal life, while Yveltal absorbs the life force of everything around it. Xerneas sleeps in the form of a tree, while Yveltal sleeps in the form of a cocoon. Xerneas and Yveltal have the Abilities Fairy Aura and Dark Aura, respectively, while Zygarde's Aura Break reverses the effects of these Abilities. Xerneas has two forms, appearing in Active Mode in battle and Neutral Mode otherwise; Yveltal has no form differences. Zygarde appeared only as Zygarde 50% Forme in Pokémon X and Y, but had two other forms and two further components introduced in the animated series and in Pokémon Sun and Moon. Zygarde's other forms are Zygarde 10% Forme, a dog-like form that includes 10% of Zygarde's full power, and Zygarde Complete Forme, whose power is said to exceed that of Xerneas and Yveltal. Its further components are Zygarde Cells, tiny cell-like creatures that make up Zygarde's body, and Zygarde Cores, cell-like creatures said to be its mind.