Eternatus

Eternatus (ムゲンダイナ) is a /-type Legendary Pokémon introduced in Generation VIII. It can also Eternamax into Eternamax Eternatus.

Trivia

 * Eternatus is, currently, the only Pokemon with a 690 base stat total number.
 * Aside from Silvally and Arceus, whose type can change to by holding specific items, Eternatus is the first -type Legendary Pokémon.

Origin
Eternatus is based on various depictions of dragons, most likely the ones depicted in the United Kingdom (the region Galar is based on). It also resembles an ancient dinosaur skeleton. According to its etymology, it may be based on Thanatos, the god of death. Strangely, its bones resemble the armor of Necrozma, who also shares links of death and space.

Etymology
Eternatus comes from the words eternal, aeternatus (immortalized in Lation), and Thanatus (Thanatos in Latin).

Its Japanese name, Mugendaina, comes from the words mugendai (infinity), dynamic, huge, and Daimax (Dynamax).