Eternatus Sword

The core on its chest absorbs energy emanating from the lands of the Galar region. This energy is what allows Eternatus to stay active.

Eternatus Shield

It was inside a meteorite that fell 20,000 years ago. There seems to be a connection between this Pokémon and the Dynamax phenomenon.

Eternamax Eternatus Sword

As a result of Rose's meddling, Eternatus absorbed all the energy in the Galar region. It's now in a state of power overload.

Eternamax Eternatus Shield

Infinite amounts of energy pour from this Pokémon's enlarged core, warping the surrounding space-time.