Snivy.... SNIVY, SNIVY!
It seems like a good idea but I'm not putting my finger on it yet. How does Delta Pokemon work in Pokemon Animeverse?It's never going to happen but as I stated before and made a video on it.
The only way they can progress with Ash is if they allow him to travel the multiverse as a Pokemon Guardian and then we'd have multple one off arcs. Ash can easily battle the 9th gen gyms and challenge the end if it while aiding in the threat to maintain himself as a guardian and then give him a device that gives him access to all his Pokemon and he can catch and evolve ones he hasn't had before with some focus being on 9th generation.
But as I've said, it'll never happen especially since it would have a fan fiction series feel and would require Gamefreak to design certain Pokemon to allow this maybe even a ton of regional variants or create a game with delta species, maybe not delta species but after this series I have a hard time imagining Ash getting something like Flygon unless its a regional variant or delta species.
But the stories Ash would go through would be endless and it could easily include future generation plot lines. The best part for people who hate Ash, Ash doesn't need to be in every episode either, it could be like other anime where the main character gets little screentime while the story focuses on the lives of other characters where Ash because he beat Leon would just be a strong driving force and is there to ensure a conflict is resolved but we can have like Serena doing gyms and being a battler for example and Ash acts like Diantha/Steven with Serena saving child Alain's Froaklin with Serena's rival Mairin's Mega Sceptile and of course rival Miette with Mega Blastoise and Serena-Delphox for the win.
The best part for me is Ash being able to use all his Pokemon with a device and even evolving some of them. Ash's Charizard, Torterra, Greninja, Lucario, etc, etc.
but it will never happen.
and Ash should have caught Flygon back in his hoenn days but nope. It's not that special enough for him to catch it.
Otherwise, there is nothing for Ash to do it.