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Reposting since last thread was pretty much over.
So after watching the SM preview again we see that Ash doesn't have the Z-Bracelet while running away from Bewear or while facing off against the Skull members.
But he does have it while entering the classroom with Kukui.
I think I've figured out how the first 1-2 episodes will go.
Ash arrives in Alola with Pikachu and goes into the city to have fun with Pikachu, Sharpedo riding, watching Poplio swim, etc. Then, while on the beach he see's Team Skull causing problems and winds up battling them in front of Kiawe. Since Topu Koko is likely to appear in the start, Ash hears that Team Skull mention it and Kiawe tells him about it.
This gets Ashs curiosity up so he and Pikachu head into the forest to look for it. Out in the forest he winds up finding Bewear and starts to run away, but unable to get away he stumbles upon Kukui who is out researching or with TopKek possibly.
In immediate danger, Kukui hands Ash the Z-Ring so that he can fight off Bewear with Pikachu. Then, seeing Ash able to pull of the move and defeat Bewear smoothly he invites Ash to the Pokemon School to learn.