Minimum stats are calculated with 0 EVs, 0 IVs, and (if applicable) a hindering nature. Maximum stats are calculated with 252 EVs, 31 IVs, and (if applicable) a helpful nature.
Eternemax's Pokédex entries
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.
Infinite amounts of energy pour from this Pokémon’s enlarged core, warping the surrounding space-time.