It is more than likely that Ash Ketchum, who is now world champion, will be retiring as the main character in due time. There's really no where else you can take this character and he's had a long enough run. While this is probably not gonna happen, as they had a Hisuian special but they didn't go back in time, I think this can be a more fun idea of what teams Ash could have if he was in the Paldea region and what a possible ancestor of him could have.
Starting with Hisuian, I think Ash's ancestor would be similar to him in terms of personality. The goofy and lovable dork who loves to battle. As for his team, I think it would be interesting if it was Hisuian versions of Pokémon he caught for his ancestor to use, as well as adding in some I think fit his personality.
Pikachu
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Cmon, this shouldn't even be a challenge. Ancestor version or not, Ash without Pikachu just doesn't feel right
Decidueye
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To make up for Rowlett not evolving in the Alola anime, having this more grown and badass fighting grass type would be an interesting thing to see.
Goodra
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I've always loved Ash's Goodra and seeing this more snail like design, plus the unique dragon and steel typing, could add an interesting dynamic with his ancestor.
