once and again: An ash from a future where pokemon went feral and attacked trainers is sent back to the past to prevent the tragedy. But to do so he'll have to have help from his alternate selves
When he'd been young the subject of death had entered his mind briefly, although that naive him would have never believed it would come at the hands of the very pokemon that he had come to love. That had been before the virus had been unleashed by an evil team whom had thought the virus would allow themg to control all pokemon regardless of level. That was how he found himself floating in this endless space. He did not have to wait long, soon Arceus himself appeared before him.
"Ash Ketchum, chosen of dimension 42, you were brought here to correct the mistake that lead to your death."
"Dimension 42? mistake? what's going on?"
Arceus sighed "You are the chosen Ash Ketchum for this dimension, one of 42 in existence that we know about so far. You have been brought here because the virus discovered by the evil ones in your dimension is spreading to other dimensions. No one knows how this is happening, but we are sure that by preventing the virus in this dimension it will prevent the problem from ever spreading. To accomplish this we are seounding you back in time but with a catch, you will have access to your alternates memories and teams. You may borrow whatever you need to get the job done. Good luck."
When Ash awoke to find himself back in his bed at his mothers house he half laughed, half cried as memories of swarms of pokemon overunning the place came to mind. He bounded down the stairs, excited.
"My, you're up early." his mother said
Ash hugged her as tight as he could "Yeah mom, I guess it was nerves, but I'll be fine now." He hugged her again as he headed out the door, but as he started for Oak's lab a memory hit him.
"Mom, you can't keep me from training. I'm twenty now, twice the age of the others whom have already left. I'm not your baby anymore."
"I just wanted you to be safe. Your father died in a training accident as you well know and I had to be certain that you could control your rather interesting starter."
Ash rolled his eyes as he looked out at Scaley, the magikarp he'd accidentally caught when he'd been fishing in the river and wished that he'd never caught the thing.
Ash shook his head as the memory cleared, so in that reality he had caught the magikarp he and gary had been fighting over, but in the process it had evolved into a Gyrados. Said Gyrados had gone on to rampage through half the town and almost destroyed the ranch before Oak had gotten it under control. As a result, that Ash had spent a year in the hospital recovering and 10 years working at Oaks ranch to make up for the damage. That Ash had learned from the professor everything he could about pokemon, their habitats, their abilities and training in general. All things that were going to be very useful on his journey. After all, knowledge was power, and he'd need all the power he could to take down those whom had doomed the world.
End chapter
So this is basically going to be super Ash with a twist. Ash is super because of necessity. He comes from a world where some evil team of no known name creates a virus that is supposed to allow them to control all pokemon, what it does instead is unlock the violent nature in all pokemon. They become mindless beasts intent on destruction. Ash of this dimension was basically an older version of Ash whom had been at home training when the virus hit. He was killed by his Charizard.