Necrozma

Necrozma was discovered dwelling deep underground, where it had been asleep for ages. Due to the peculiar nature of its body, the power it wields, and the rumors that it came from another world in the distant past, it is speculated that it may be related to the Ultra Beasts, if it is not actually one itself; however, the International Police have no records of it ever emerging from an Ultra Wormhole so its classification is still uncertain.

Despite being pitch-black, it constantly refracts light like a prism.

This Pokémon is extremely hostile, and will attack relentlessly to get Solgaleo or Lunala.

Necrozma originates from Ultra Space and is capable of opening and traveling through Ultra Wormholes. This causes many to believe Necrozma is one of the Ultra Beasts, however, different accounts refer to Necrozma as a "reminiscent of the Ultra Beasts" and "a creature almost like an Ultra Beast". It once had the ability to give light in its original form, but lost this ability along its true form after being heavily injured by the Ultra Recon Squad's ancestors in an attempt to steal its light; Professor Kukui and Lillie theorize that the Sparkling Stones and the Z-Crystals used to perform Z-Moves are fragments of Necrozma's body that it lost upon being injured and rained down into Alola. According to the Ultra Recon Squad, the light that radiates from Necrozma is the aura that surrounds the Trainer and Pokémon while performing a Z-Move and the aura surrounding a Totem Pokémon. This energy is consumed by Pokémon such as the Ultra Beasts and radiated by Pokémon such as Solgaleo and Lunala.

Necrozma does not talk much, if not at all, he doesn't have a visible mouth so if he everrrr talks (which is rare af), he talks telepathically, and that way only, so it sounds echo-like when he talks, very deep and much reverb.

Necrozma is a vaguely humanoid Pokémon whose body appears to be constructed out of a black crystalline material. The black color is a result of impurities building up within it as a result of its deep slumber. The large protrusion attached to its head is its tail, which has a row of three large spikes along the top and is white in the back with a dark gray symbol resembling a star in the center. Its face is actually a prism-like object known as the brain prism, which possesses a collection of multicolored shapes that resemble eyes. While absorbing light, this brain prism glows white.[1] Its thin arms have disproportionately large hands with three claws. Jutting out of the back of each hand is a whitish crystal that darkens toward the tip, and each elbow has a hook-like spike. Two large spikes jut from each shoulder and there is a row of smaller spikes along each side of its body. Its feet have three hook-like toes each.