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I'm not working in the translation team or something similar to this, but I can say that I have basic knowledge about this game.
> Story (what a surprise) only slightly altered, it's no sequel. But it has some more or less surprising turns, Mohn does come back to the Aether Foundation and as the story progresses he remembers some things that happened before a specific incident
> New forms of Solgaleo and Lunaala are just fusions with Necrozma
> The legendary pokemon do play a much bigger role in the story, Lusamine will try to unite all three of those to 'the ultimate pokemon'
> there are less trials, but there are more classic gyms, overal 10 gyms and trials
> new pokemon are added to the regional dex like tyranitar and shuckle, Kalos Starters are distributed in game after the first gym in hau'oli city
> new alola forms, this time only johto pokemon, like alola shuckle which is water/rock
> more appearances of past characters like Blaine and candice, candice is constantly bothered by the hot climate of Alola
> Battle tree got massively expande
Well, overall, it's the same game tbqh