>>33709414>>33709424I think that certain Pokémon are guaranteed to be in (Heatmor because it got a signature move in SM, and Durant by extension, and also fossils to make the fossil park not useless). Cubchoo and Beartic got Slush Rush (a Gen VII Ability normally exclusive to Alolan Sandshrew) as their second Ability while Beartic got an Attack buff. Raikou, Entei, and Suicune got their Hidden Abilities changed because of Gold and Silver on the VC. Mantine got a buff, and it and Mantyke are most likely going to be obtainable in USUM since it's a Poké Ride (though Charizard begs to differ).
There was also that guy last year on /vp/ who said that the remaining Alolan forms to be revealed were Diglett/Dugtrio (came true), Geodude/Graveler/Golem (came true), Ekans/Arbok (didn't happen), and Doduo/Dodrio (didn't happen). But he also said that there would be a special demo for Sun and Moon in late October that would let the player transfer Ash-Greninja to their game, which came true.
Interestingly enough, Arbok and Dodrio received buffs in Sun and Moon (as did Dugtrio and Exeggutor), implying that this "leaker" might have been legit and that they were just held back from SM.
Solrock and Lunatone seem likely for obvious reasons and there's also that guy who asks to see them in Haina Desert. They received buffs in SM so I wouldn't be surprised if they get Alolan forms. They'll probably be version-exclusives.
Volbeat and Illumise are counterpart Pokémon and will probably be (pointless) version-exclusives.
Pelipper got Drizzle, Torkoal got Drought, Gigalith got Sand Stream, and Vanilluxe got Snow Warning (the whole weather set, most likely for SOS battle use) as their second Abilities, while their prior evolutions also got second Abilities.
Mega Alakazam got a buff to make its Mega Evolution a +100 to its BST like every other Mega Evolution, which is probably just correcting an oversight in XY.