Thanks to CityLover96 for suggesting such a wonderful idea for a story!
Ash was standing on top of Mt. Silver, training with his Pikachu.
Ash had managed to become the Ultimate Pokemon Master.
Ash had been the Chosen One ever since he was born.
On the day he was born Arceus blessed him with eternal youth , eternal victory and the Jewel of life.
Ash had never lost a single battle in his life.
There was even a rumour that Ash was actually Arceus's illegitimate son.
Ash had always won every single battle.
He had won every single GYM battle, and also all of the Regional Pokemon Leagues, and also all of the Elite Fours, and also all of the Champions.
Ash had even won in hand-to-hand combat in a duel with Arceus himself, and Arceus was the Creator of everything that existed. That meant that Ash was so powerful that he could even alter reality if he wanted to. His Pikachu singlehandedly disbanded all of the evil organizations as if they were amateur bug-catchers and youngsters.
Ash was a model of manly behaviour on his 20th year of victorous life. He had become more mature, more serious, more smarter.
He was not even slightly childish, not hyperactive, not dense.
Ash was truly a transdescendent being...He always had a golden oreole shining over his head. He always wore a white tunic that hung on his left shoulder and a laurel wreath. He didn't even need to carry his Pokeballs, the Pokeballs just floated around, following him in the air.
As for the Pokemon that Ash possessed, he had caught by himself all of the Pokémon, plus all their gender differences, alternate forms, mega evolutions, primal reversions, and Alolan Forms - they were all placed inside marble Premiere balls that always floated around Ash in a giant flock/cloud that he could sit on or fly on or just follow Ash from afar.
Pikachu was Ash's chosen Pokemon that had the privilege of always being outside its Pokeball, it always walked alongside Ash as his equal.
Ash has every single GYM badge in the Pokemon World.
Ash also has all of the Coordinator ribbons. Ash has all of the Z-crystals as well, also he has all of the Mega stones.
Ash also has all of the Pokemon devices - the Pokedex, the Pokegear, the Pokenav, the Poketch, the Xtransceiver, the Holocauster, the Rotomdex and many more.
Ash was planning to become the ruler of all the Pokemon World - he dreamt of creating his own empire. In order to do that, he would need to conquer all of the regions in a war with his Pokemon army. Ash knew- he was capable of conquering the entire Universe...But everything has to be done one step at a time, even such a person like Ash the Ultimate Pokemon Master realized that.
But first, he needed a wife, or maybe several wives in order to leave descendants who would continue his divine dynasty into the history of humanity.
And so, his first objective was to find someone who could become the mother of his children and the Queen of his future Empire.
Ash stopped his training with Pikachu when he warmed up enough and used his personal Mega Rayquaza to fly to Pallet town.
He would start searching for the ideal brides in Pallet town and go all the way to Alola to pick the most worthiest females in the Pokemon world.
After completing his harem, he would declare war on the Pokemon world until it would all belong to him...And after that...there were a lot of intergalactic space and different dimensions that were waiting to be conquered.
Ash was a human after all, so he needed to sleep and eat like everybody else. So after having dinner at his Mother's house he fell asleep until the morning. His Pokeball cloud accommodated in the kitchen - Ash's Pokemon were so durable that they didn't even need to leave their Pokeballs unless summoned for battle.
After all, there was a lot of stuff that needed to be done tomorrow.
Ok so there's a possibility that I'll change the rating to M in the future.
P.S. Before some certain people leave a message about this being an "anime" story, I want to say that this fanfic will feature characters from all available Pokemon Worlds.