>>33336863New Alolan forms
Pokemon World Tournament with all major NPCs
Battle Tree with upgraded special trainer list
Legendary Gens I-VI Pokemon are made available in USUM.
At least 15 new Alolan forms, most if not all of whom have unique type combinations (also give me a new type combination for Dark)
Tutor moves with ORAS tutors + Sucker Punch and Defog
Great level-up system akin to ORAS' Blissey Bases
Battling Trial Captains BEFORE attempting their trials (only done for Ilima in SM)
Bigger roles for Plumeria, Wicke, Faba, Guzma, Gladion, Hau, Lusamine, and Lillie
Species-exclusive Z-Moves retconned to have additional effects like Kommo-o's Clangorous Soulblaze
NPCs from past generations appear (and can be battled)
Much better encounter tables (not have Yungoos/Alolan Rattata fulfill most encounters while more coveted Pokemon are confined to one route at 10% or lower encounter rate)