Eternatus

Eternatus (Japanese: ムゲンダイナ, Mugendaina) is a Legendary Poison/Dragon-type Pokémon introduced in Generation VIII. It is known as the source of the Dynamax phenomenon in the Galar region. It arrived in Galar 20,000 years ago in a meteorite and caused a calamity known as the Darkest Day 3,000 years ago. Eternatus is capable of absorbing energy from the Galar region to sustain itself and has a unique transformation called Eternamax, where its form drastically changes and becomes incredibly large. This form cannot be obtained by the player in the game. Eternatus has a distinct appearance, with a dragon-like body made of blue crystals and red transparent screens, with a core inside its body. It has appeared in the anime and manga, playing a significant role in the storyline of the Galar region. It is also known for its unique moves, Dynamax Cannon and Eternabeam.