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You might not like it but this is the objectively darkest pokémon design ever. Other mons just try with some usual menacing/evil look, sometimes more generic, sometimes more original, but all of them feel like pokemon, either animals, machines or weird humanoid creatures that are in the border between man and beast, but each one feels like a pokémon you could eventually befriend, every pokémon has a face you can look at and say "hey bro", but this thing? This thing is an eldritch abomination that came from outer space to our planet and "infects" other creatures with its power, causing mass destruction not only where it landed but even far away because its seemingly endless energy disrupts the very fabric of spacetime, reality itself is just shaked by its mere existence, and all can it do in this form is destroy everyone who tries to oppose its primal desires while the world burns down after being flattened by giants.
That's the Darkest Day, that's Eternatus.