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It's my theory that the original dragon spoken of in Unovan myths, the one that became Reshiram, Zekrom and Kyurem was actually Ultra Necrozma, one that was native to the Pokemon world rather than Ultra Space.
>Giant, bipedal, winged dragon with the powers of a god
>Has giant wings with fingers like Reshiram
>Has black armor akin to Zekrom (This can be seen both in it's normal form and when it's defeated in Ultra SuMo)
>Has a long tail pulsing with energy like Reshiram and Zekrom's engine tails
>Comprised of an intense energy like fire and electricity for Reshiram and Zekrom
>One of it's most powerful attacks involves gathering their energy into a giant ball and dropping it to attack, similar to Fusion Flare and Fusion Bolt
>Used to be allied with humans until a specific incident happened that forever changed it
>Can be fused with Solgaleo or Lunala like how Kyurem can be fused with Reshiram or Zekrom
>Despite this, it can never fully regain it's former powerful form (or at least not permanently in Necrozma's case)