Eternatus is a Legendary Pokémon first discovered in the Galar region. According to legend, it is an extraterrestrial Pokémon that crash-landed 20,000 years ago. 3,000 years ago, it awakened for the very first time, threatening to destroy the whole region with its power, in the event known as the Darkest Day, but it was stopped by Zacian, Zamazenta, and two humans.