This is an idea for new Pokemobians based off of the Pokemon Xerneas.

Description:
The Xernians were created several years ago by a Xerneas who used its Fairy Aura in conjunction with the Chaos Emeralds to create them. The Xerneas who created them entered its tree form for 1000 years on the planet of their birth, which would become Xernia. 1000 years after Xernia's foundation, the Xerneas who created the Xernians turned back to normal and left to voyage the various planets.

The Xernians are a highly advanced race. Xernians are capable of living for at least a thousand years. When a Xernian is at the end of its life, it turns into a tree like Xerneas, but some have been able to change back to a Xernian after a week, hinting that a Xernian can have multiple lives. The Xernians have utilized their Fairy Auras to allow them to create great feats of technology to help them fight.

Pictured are examples of a male and female Xernian. I'm going to name them Xetrax(left) and Xaen(right).

Xerneas - Pokemon/Nintendo
Xernians - Me