>>51244135That's because there really was no plan. Lusamine in SM is literally nutters.
She gets high on jellyfish toxins, decides she'd like to spend eternity with them in their home dimension, and nearly succeeds in stranding herself there. Assuming nobody came looking for her, the rogue Ultra Wormholes across Alola would probably stop generating, and she'd be perfectly content in Ultra Space until she died.
I think SM is the one story in Pokemon where you're not saving the world from the antagonist, but rather saving the antagonist from themselves.