Ash won't be in the new anime nor will any other people or pokemon expect a singular Sobble. Sobble's lonely journey through the abandoned Galar region will divide fans at the time of broadcast but will be looked back on fondly by all. The series will get very deep as Sobble ask's himself philosophical questions and wonder that the point of it's existence is, however Sobble with not talk, he won't speak english or repeat his name as he will be mute,this only applies to the individual Sobble and not the species (though Sobble will be the only character so this won't matter), any other characters will all exist inside Sobbles mind as elements of his Psyche and they will all be mute like Sobble. The Series won't be popular amongst the target audience but art critics who never though twice about Pokemon will be heaping the series with praise. Eventually a separate Ash based Anime will appear and run alongside the lonely Sobble series. Most of you will prefer that but the Sobble-hearted will remain strong and will help the Sobble sereis reach a higher level of fame, recognition and achievement than any pokemon anime before or since. The Sobble phenomenon will not repeat it self and we'll all wonder why the pokemon company made it and why they'll cry whenever we mention the series. Are their tears or pride, guilt or shame?, We join them in weeping for we will never know.
At least that's my prediction, makes more sense to me than what everyone else is suggesting.