>>34124659Ah, I see you share a common misconception most people have about Lusamine.
You see, she wasn't acting evil in SM (and USUM) because he was infected with Nihilego's toxins. In fact the first time she even SAW a Nihilego was at that time it appeared at Aether when the MC and Hau were there. Nihilego only started affecting her when she went to Guzma to its Ultra Space.
What made Lusamine go from a good mom to a crazy cunt was losing Mohn. The only difference between SM and USUM is how that grief affected her. In SM she became obsessed with Ultra Wormholes because she wanted to bring Mohn back, but after some time that obsession transferred to the Ultra Beasts themselves.
In USUM the obsession was the same in the beginning (Wormholes -> UBs), but when the Ultra Recon guys appeared and talked about Necrozma being dangerous, Lusamine became obsessed with "saving" everything and everyone, because she couldn't save Mohn in the past.