How do the mechanics of fusing Necrozma work - Generation 7 - Project Pokemon Forums

For example: Let's say I have a Jolly 31/31/31/0/31/31 Necrozma, and an Adamant 1/12/31/31/31/21 Solgaeo. Does it use Necrozma's spread or is there some other formula? Thank you for any help.

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