Zygarde

Zygarde is a dual-type Dragon/Ground Legendary Pokémon.

It is not known to evolve into or from any other Pokémon.

Biology
Zygarde is a Pokémon whose form depends on the percentage of its Cores and Cells gathered together. Zygarde Core is the brain of Zygarde. It is a small, green Pokémon with a gelatinous body. It has a large, round head with a beak-shaped protrusion on the front, a thin, hook-shaped tail, and a red hexagon suspended in its body. Within its head is a single eye with a black pupil; beside this eye is another white oval that may be a second eye. As seen in the anime, Zygarde Cores are capable of absorbing sunlight to regain their strength and can speak telepathically. Zygarde Cells make up every other part of Zygarde and appear nearly identical to the Zygarde Core. Unlike the Core, it has a flat body and head. It has a green pupil, a simpler, unhooked tail, and has a darker green, more elongated hexagon within its midsection.

Cores and Cells do not have the power to battle alone and can only fight when combined to form Zygarde. The Cores have their own will and are sometimes able to act on their own, while the Cells form the rest of Zygarde's body and are only able to act on the Core's orders.[1]