Considering Chloe said she wants to learn about evolution, I see her going with Sonia or something like that. Or more research with her dad. Besides the show usually likes to keep the battling mostly relegates to Ash. So Chloe do gyms in paldea I feel will overlap with Ash too muchThis episode is probably the final "recap" of the series.
Ash reflects on how far he has come and what his new title really means. Goh reflects on the end of Project Mew and how we will continue to pursue Mew. Chloe finally makes a choice and asks Ash to tutor her in the concept of Pokémon Battling taking the next step of her and Eevee's journey.
Ash makes a next step of becoming someone's mentor.
Personally I'm hoping that the traveling nature of JN stays but this time with Ash and Chloe. Ash trying something in Paldea and Chloe attempting the Kanto League.
Especially if they plan on making Ash do gyms