>>33298683After the Aether infiltration, you go to see Alola overrun with UBs. You see several more of the characters battling them throughout the islands.
You have to go and visit Kukui and Burnett who know about the phenomena.They tell you about the how the legendary pokemon can open or close Wormholes and that to avert this crisis, you need to summon it. Hau and Gladion offer to help fend off the beast, Gladion especially since Silvally is a beast killer.
Lillie wants to come with you because she knows she's no help in a fight and says she wants to make things right any way she can. the Poni island section is largely the same, but there's more dread and people nervous.
Getting to Lusamine, you can actually explore the Ultra Space, encountering a bunch of wild Nihlegos. Once you arrive, she taunts, yaddy yaddy yadda, but instead of transforming right then and there, she reveals her goal to replace people and normal pokemon with her "perfect" beasts and herself. She says she plans to open an even bigger Wormhole on the largest point of Alola. Mount Lanakilla. You, Lillie and the legendary go back and have to hurry on to Lanakila.
Yup, no half ass league here, instead, you climb up Lanakila, battling up until the top atleast 4 different beasts. The encounters are different based on version. Buzzwole, Xurkitree, Kartana and Guzzlord in Sun, and Pheromosa, Xurkitree, Celesteela and Guzzlord in Moon.
All of them are totem like battles, with a Nihlego helper.
Once you reach the top, Lusamine gives another crazy speech and you finally battle her in a distorted area around the top of Lanakila. If making her the boss is too ambitious, just have it be like the one in the game.
After the battle, you get the same emotional scene between Lillie and Lusamine. Afterwards there's an epic scene of the legendary summoning all their power and creating wormholes that the UltraBeast around Alola are attracted to and go back in. Alola is saved and crisis averted.