If the next series follows a similar route of having Ash obtain a team consisting of past and new generation pokémon which ones would you like him to catch this time around that is if Ash does continue as the main character?
Here are my personal picks of what his team could consist of:
Pikachu
Arcanine, mainly since he didn't get a fire-type in the current series.
Dunsparce, but only if it does end up getting a new evolution.
Tyranitar, preferably the very same Larvitar that he cared for in Johto.
Hisuian Zoroark, since LA will continue to be on store shelves for a long time.
A Gen 9 Pokémon, preferably one that has a type that differs from the rest of his team.
Mine:
Kanto: Kangaskhan( the one that took care of Pikachu when he a pichu) Wartortle ( Bulba not ever going to evolve so why not)
Johto: Tyranitar (The one that Ash took care off), Meganium (Bayleef evolve), Typhlosion (Quilava evolve), Croconaw (Totodile evolve)
Hoenn: Crawdaunt (Ash Corphish finally evolve), Blaziken or Swampert (Either 1 is ok, both would be good)
Sinnoh: Gabite/Garchomp (Ash Gible finally evolve), Empoleon
Unova: Zoura/Zoroak (normal or Hisuian would be ok), Gigalith (Ash Boldore finally evolve , offscreen trade with Goh?) Seismitoad (Palpitoad finally evolve), Servine/Serperior (Snivy finally evolves), Emboar (Pignite evolve) and Dewott/Samurott (Oshawott evolve, normal or Hisuian also ok for me) Bravivary( Normal or Hisuian also can)
Kalos: Gogoat? Tyrunt/Tyrantrum
Alola: Dartrix (Rowlet evolve), Alolan Sandslash, Kommo-o
Galar: Corviknight, Obstagoon,Dragapult
SV: Lechonk (Would love to see it fighting Ash for food) Sprigatito