It's been Reborn.

Eternatus appeared for the first time as it flew through the clouds, next to Ash and Goh's plane heading to the Galar region. When Chairman Rose released Eternatus, he revealed that he had been looking for strong Trainers to catch it so it could power Galar for eternity without the dangers that came from doing so. However, Eternatus broke free of the safety barrier that had been installed via Dynamax Cannon and began causing havoc. It turned to you, curious.