>main storyline
- Lillie flees Aether without Nebby, is going to become trainer and go back to rescue it
- Lusamine is recklessly trying to open ultra wormholes (using Nebby) to find her husband Mohn, her mania heightened by the Nihilego poisoning her mind
- You clash with Lusamine at the Lake of the Moone, Aether Foundation, and the Altar of the Sunne
- After a final battle against Lusamine's pokemon, she fuses with Nihilego and you have an epic (boss-level HP) battle with her fused form.
>new areas
- golf course, hotel grounds, cascading pools at Brooklet Hill, volcano interior all accessible
- you can explore the Power Plant (a bit like the interior of Virbank Complex)
- the Lighthouse is now like Trainer Hill in Emerald
- Lake of the Sunne/Moone is fully explorable and a key plot location
- Jurassic Park has become a reality (it's like a mini Safari Zone for fossils)
>new pokemon
- expanded pokedex with many old pokemon returning
- Lusamine's wormhole tampering means you can find low-level UBs as 1% encounters in some later-game locations
- 10 new Alolan Forms from gens 2-6
- All the additional pokemon from real USUM like Lycarrot
>Team Skull
- Still acting like petty criminals, still helping Lusamine
- Guzma and Plumeria have UBs
- Nanu teams up with you to infiltrate Po Town, including a double battle with him against Skull Grunts
>battle facilities
- Battle Tree is still there, expanded with more returning characters
- Royal Avenue has Battle Royal Dome and a new Battle Factory
>trials
- Beat the Trials, then battle Trial Captains to obtain badges
- Ilima, Mallow, Lana, Kiawe, Sophocles, Acerola, Hapu and Mina have trials/battles
- The E4 is Hala, Olivia, Molayne and Ryuki, with Kukui as the champ
>postgame
- Episode: Necrozma, where Faba goes rogue and unleashes Necrozma from an ultra wormhole
- Looker and Anabel recruit you to take down some high-level UBs roaming Alola
- Ultra wormhole quests to find UBs (similar to what we have in the real USUM)
