Best definition
A Pokemon that was introduced in Generation 6. It is known throughout the kalos region as the balance Pokemon. It

burrows deep underground and rises when the earth is out of balance. In worse case scenarios it collects all of its cells, spread across the entire earth, to defend whatever is bringing the world out of balance. In games Pokemon X and Y, Omega Ruby and alpha sapphire, and Sun and moon.

“I just caught a zygarde !”