Quoted By:
USUM should've had it where she's faking trying to help the Ultra Recon Squad stop Necrozma, only to betray them once she obtains Cosmog and she goes with Guzma to find Nihilego like the original game.
Following that, she likely fuses and becomes the Mother Beast, only for Necrozma to appear and slap her shit so hard she seperates from Nihilego and the two get sent back to the Altar. The rest of USUM plays out except Nihilego's toxins inhibits Lusamine for a full month, following the same period as Gladion training in Kanto.
Apologies for the autism.
