Ash will have a harem of Leaf, Elaine, Kris, Lyra, May, Lisia, Zinnia, Dawn, Iris, Hilda, Rosa, Bianca, Serena, Shauna, Emma, Aria, Lana, Mallow, Lillie, Selene, Marnie, Bea, Gloria, Juliana, Nemona, Penny, Risa, and Anabel. Ash will rotate his team more often but they will be as strong as if not stronger than canon. Characters without anime versions will have their Masters personalities mixed with their Adventures personalities. Ash should be 17 by the end of Galar everyone he travels with is the same age as him when they meet. Levels don't exist and there is no 4 move limit. Ash's mega stone will be in an Arceus star necklace. Ash will have every Pokémon he has in cannon.
OS:After Ash beats Brock instead of Brock joining Ash Leaf and Elaine will. They both are from Pallet Town Elaine's Eevee was a gift from her mom. They will travel with Ash all the way to Kalos and will compete in the league. Tracey will still travel with Ash in the Orange Islands. Lyra and Kris will be childhood friends and will meet Ash when he meets Casey and decide to travel with Ash after he beats them. They will also compete in the league. Leaf, Elaine, Lyra, and Kris will fall in love with Ash after the league of their native region. Misty will still travel with Ash but won't fall for him. Larvitar will become Ash's after they meet his mom. Ash will catch Gengar and Dragonite during this part of the story. Ash will catch the manga Eevee. Ash will catch Brock's Zubat.
Hoenn: The plot will be that of ORAS. Ash will go to Hoenn with Leaf, Elaine, Lyra, and Kris. Ash will still travel with May and Max. May will fall in love with Ash after their contest battle. Ash will catch the Mudkip that Brock would have and a female Torchic both will evolve all the way. Zinnia will fall for Ash after the Delta episode story line and join him on his journey. Lisia will fall for Ash after his battle with May. May will join Ash after the battle frontier Max will go home. Anabel will fall for him after their battle. The Lucario ash gets will be given after the Lucario movie in an egg that will be implied to be that Lucarios kid. Prime ape will join back up with Ash here. Squirtle will join Ash again after the Battle Frontier. Ash will catch Brock's Fortress.
Sinnoh: The girls who are traveling with are still there. Ash will still travel with Dawn. Your choice who bonds with Uxie. Ash will take in Hunter Js Salamence after her arrest. Ash will be four of Tobias Pokemon and they will battle in the final instead of semi finals. Dawn will fall for Ash after the Arceus movie. Ash will compete in the Battle Frontier here. The Crogunk Brock catches is now caught by Ash. Ash will catch Brock's Bonsley and Happiny. Ash will catch the Hippopotas that he holds on his head.
Unova: Dawn and May will be in Unova because contests have started here. The others want to compete in the league. Ash will meet Hilda and Rosa at the same time as Trip and they will join him after he beats Trip with Pikachu. Ash will always beat Trip. Ash will not beat the Unova league but will beat Cameron. Ash will take in Ghetsiss Hydreigon. Iris will join Ash at the time she does in canon. Cilan will not join Ash. Ash will send his Pokémon caught in Unova to Juniper in the beginning but after he learns she doesn't let them out of their poke balls he changes where they go to Oaks ranch and they all become stronger than in canon. Iris parts with Ash when she doe in canon. Iris will fall for him after the Victini movie which will be the Zekrom movie. Hilda and Rosa fall for Ash after the incident with Meloetta. Bianca will travel with Ash till the defeat of Team Plasma and fall for Ash after.
Kalos: Dawn and May wish to try out showcases that's why they join Ash in Kalos. The other wish to compete in the league there. Ash beats Alain with Greninja. Ash will travel with Clemons and Bonnie until their gym battle where they part ways. Serena still joins Ash and in love with him since he jumped off Lumiose Tower. Ash will catch a female Chespin and a male Fenikin both will evolve all the way. Serena will convince them to share Ash after the Pokémon league. Aria will fall for Ash after the battle with Team Flare. When everyone parts ways with Serena gong to Hoenn to compete in contests there and still kiss him. May and Dawn go to Johto to compete in contests they kiss him on the cheek. Hilda and Rosa will go home to Unova and like May and Dawn will kiss him on the cheeks both of these kisses will happen at the airport in Kalos. Kris and Lyra will kiss him on the cheek when they part ways once they land in Kanto. Elaine and Leaf will do the same when they get to Pallet town. Zinnia will go home but not kiss Ash. Pigeot will join Ash when he walks home. Goodra will join Ash again after the battle with Team Flare. Shauna will fall for Ash after the defeat of Team Flare. Emma will fall for Ash after the Looker storyline.
Alola: The girls from the previous journeys minus Iris will join Ash on his vacation to Alola and join him in school. Selene will replace Sophocles in the class. Selene, Lillie, Mallow, and Lana will fall for Ash after Nebby evolves into Solgaleo. Nagandal will never part ways with Ash he won't catche a Poplio. Lapras will join Ash again after his battle against Topo Koko. Ash will still win this league.
Galar: All the girls minus Iris, Mallow, Lana, and Lillie will travel with Ash. Ash will travel through Galar and catch all three starters. He will catch Farfetchd and Dracovish here he will also get Zacian, Galarian Ponyta, Obstagoon, and Rapid Strike Urshifu. Gloria and Marnie will travel with him in Galar after the opening ceremony. They will fall for him after the Darkest Day. Gloria will catch Eternatus. Bea will fall for him after their gym battle. Ash and the girls from the other regions will not compete in the Pokémon league but will challenge the gyms. Team Rockets Meowth joins Ash after Jessie and James are fired.
Masters 8 will occur a year after the Galar league. Ash will in that year meet Risa and have Greninja return to him. Ash will win the Masters 8 with two Pokémon left instead of one. The girls will confess to him during the party after celebrating his victory. Ashs Charizard will be the strongest Charizard without mega evolution and gigantimax
Paldea: Ash will be 19 he will go to the academy to help guide the students forward. Juliana and Nemona will fall for him after their third match Penny will fall for him after Operation Starfall. His now girlfriends will stay with him at the hotel he stays at in the region. He will catch Koraidon, 30 Tauros 10 of each breed, all 3 starters, Dunsparce, Ceruledge,Ogrepon, the loyal three, and Pecharunt. Pikachu will be stronger than every non legendary Pokémon in Paldea. He will catch the loyal three and Pecharunt to keep them from causing trouble. He will help Liko.
Legendary Pokémon: Ash will catch Mewtwo after they meet the second time. The Mew that hangs around Oaks ranch is caught shortly after. The Regis in the Tree of Beginning will become Ashs but not travel with him or go to Oaks ranch instead stay at the tree they will also include a Regigas, Regidrago, and Regieleki. The Shamouti birds and Lugia will also be caught by Ash but will stay at Shamouti. The Latias from Alto Mare will be caught by Ash right after the events of the movie. The shiny beast from the Zoroark movie will be caught by Ash after the movie. The creation trio will be caught by Ash after the defeat of Cyrus. Shaymin will be caught by Ash after he leaves Sinnoh but before he goes to Unova. The Rayquaza of the Delta episode will also be caught same with the Deoxys. Ash will catch Zekrom after N and Reshiram meet. Victini will be caught after the movie. The Genesect that Ash befriends will be caught after the movie. The Zorua and Zoroark from the movie will be caught by Ash around the mid point of Unova. The lake trio will be caught by their respective trainer. Meloetta will be caught after Giovanni's defeat. Arceus will join Ash after the Arceus movie(Legends Arceus method). Ash won't use any legendarys in the League or Masters 8.
Teams of the game original characters and Lyra at the end of their region:
Leaf: Blastoise, Flareon, Nidoqueen, Nintales, Kangaskhan, Clefable
Elaine: Eevee, Umbreon, Espeon, Leafeon, Flareon, Vaporeon
Kris: Feraligator, Porygon-z, Victrebell, Tangrowth, Tauros, Raticate
Lyra: Meganium, Marill
Hilda: Serperior, Throh, Liepard, Braviary, Accelgor, Hydreigon
Rosa: Emboar, Sawk, Stoutland, Mandibuzz, Escavalier, Haxorus
Selene: Decidueye, Bewear, Alolan Raichu, Alolan Persian, Toucannon, Kommo-o
Gloria: Cinderace, Corviknight, Perserker, Dragapult, Zamazenta, Single Strike Urshifu
Juliana: Quaquaval, Wugtrio, Killowatrel, Cetitan, Baxcalibur, Dachsbun
Unique aspects of story Pokémon and humans have a "Destined Bond" basically certain Pokémon and trainers are destined to be together the bond is required to mega evolve Pokémon and they grow stronger than with other trainers example a Snivy with a destined bond with their trainer is stronger than a Serperior without one. Ash and every Pokémon he catches have a destined bond so do all of his traveling companions. Champions have 6 to 8 destined bonds, Elite four have 6, gym leaders have 3, Ash's rivals have 1 and the average trainer has 0. Those who have destined bonds can communicate with their Pokémon perfectly.