>>30401377ROYGBIV, the color spectrum
One of Necrozma's basis is the prism
Hawaii is "the rainbow state"
A lot of the themes this generation is light, and all those connect to the theme. Then we have day and night/light and lack of, or radiation, reflection, and refraction of light for all three.
>>30401233>dead Cosmog>third Cosmog formStop this meme. Necrozma doesn't have to be directly connected to Cosmog in that way to be the third legend. He can be totally seperate. Unlike Solgaleo and Lunala, Necrozma shares absolutely zero resembelences to Cosmog, while the other two share many. Pic related is a rough sketch of Necrozma's face. Please tell me that looks like a dead Cosmog.
He's an Ultra Beast who has been in our world since ancient times, having semi lost his UB status, just like Cosmog, but they aren't the same family. Like I said earlier, he is based on a prism(others being a dead star/black hole, aka necro plasma), hence his design(look at his back and his face) and his signature move, Prismatic Laser. He will have something to do with using light, perhaps from Solgaleo or Lunala in some way. He could have a Day Form and Night Form, or Sun Form and Moon Form. Something of that general idea.