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Necrozma's ripoff
>Alien crystal dragon.
>Rose had the SAME idea of the UltraMegalopolis inhabitants.
>"Squeeze the power of some legendary pokémon to get free energy."
>It provoked the generational gimmick just with it's existence. Z-Crystals, Wishing Stars.
>Both of them are refered as some type of "situation" not it's pokédex name mostly all the time. Necrozma as "The Blinding One" and Eternatus as "The Darkest Day"
>Have a extra-powerful special form for a boss battle.
Eternatus is just a Necrozma copycat.