On the 11th of November, 2022, Ash Ketchum defeated Galar's Regional Champion Leon, potentially bringing a 25-year odyssey to a possible poetic end. With the anime industry in turmoil in recent years, there has been nothing of an anime followup focusing on the Paldea Region because Studio OLM, the studio behind the Pokemon anime from the very beginning, was not spared from the turmoil either. This could mean the Pokemon anime is reaching the end of the road. If that is true, the theories of Pokemon being all just a dream from a dying Ash Ketchum, as well as becoming a Pokemon Master is the moment right before you die, will possibly be proven correct. Let's just hope Ash Ketchum does not have a Death Seal similar to the one placed inside Princess Sakura by Fei Wong Reed...
If there was anybody who said that Ash Ketchum will become Pokemon World Champion before Waluigi becomes a playable character in a Super Smash Bros title, that person just got proven correct...
With all that said, Ash Ketchum being playable in Super Smash Bros might not become a reality, much to my disappointment, because I wanted him to go toe to toe against Nintendo's other characters, including Mario, Donkey Kong, Kirby and perhaps third-party characters such as the Street Fighter duo of Ryu and Ken. But the biggest disappointment in my opinion will be that Ash Ketchum will never be able to go toe to toe against Sakura Kinomoto because that was what I was wishing for back in 2001.
All in all, Congratulations, Ash Ketchum! You have finally become the very best that no one ever was!
Update: The Ash Ketchum Arc has officially ended, and it ended with "Next Time, A New Beginning". We do not know if he will reappear in Pokemon Horizons in any way possible, nor will he ever appear in a future Super Smash Bros title. At least he did not possess a Death Seal. In other words, Pokemon Horizons will be a new beginning indeed...