These are the Kalos Region Legendaries
Xerneas has the power to share eternal life. He can be found behind the magikarp spawn
Its life span is said to be 1,000 years. When it reaches the end of its life, it steals all of the spirits around it. It can be found at the bottom of the cloud below Zapdos.
It is said to monitor the ecosystem, and if the ecosystem falls into disarray, it appears and reveals its power. It can be used when you have both Xerneas and Yveltal