It would be really interesting if 19!Ash went to past and 11!Ash just didn’t exist anymore. Ash just has all of his legendary-beating Pokemon with him and proceeds to beat everyone’s butt while still being a adorable goof trying to find his way home. Misty meets him when Pikachu just straight-up blasts the Spearow out of the sky because, hello, that is not normal lightning and Brock meets this kid who beats him with Scraggy and is like, oh, may I travel with you?
Hello! You are welcomed to use that idea for your own au and while I do appreciate input that’s majorly different than the original purpose I made this au, which is exploring how current ash would interact with his younger self due to having similar yet different personalities, so eliminating 11 year old ash would defeat the whole point
And while pikachu is a champion level pokemon and of course time traveled with current ash, the only other pokemon he has on him is dragonite, gengar and mr mime which while powerful aren’t champion level or legendary defeating level quite yet (and I might include riolu too if it’s what hatches out of the egg in the next episode) because that’s all he has catches in the new series so far, pikachu can definitely defeat most opponents it comes across at this point but not in one shot, which is okay I’m trying to avoid making current ash op since again the main focus is his interactions with his younger self
And again the original trio are at the point where the episode school of hardknocks is going to happen in a day or two when current ash shows up which is how he meets them all, and while I did say current ash still looks the same the original trio can tell he’s older than he actually is due to several reasons I’ll get to in a different post