Take an Extra Step, GOH the Extra Mile (The Prologue)
10 parts Complete This book is part of a series. If you have not read the first book, then you won't understand what's going on here at ALL. Please go read 'Not Everyone is a Steal-Type' before continuing. It can be found on this account. (There's also a reading list dedicated to this series.)
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They failed... Ash failed. Ash and Goh were unable to summon Zacian and Zamazenta, which resulted in his research partner getting eaten. Goh no longer exists. He never existed, apparently.
Time went backwards, making it so Ash just entered Alola. That's a long time to go back! That means Riolu has yet to hatch, the Alola League has yet to happen, and Ash hasn't even obtained his Alolan Pokemon... meaning Dragonite, Gengar, and Galarian Farfetch'd are not his.
Also, only a select few of Ash's friends ended up remembering the events, two of them being his Alolan Parents and all their Pokémon.
Now in such a position, Ash feels lost... as if he cannot do anything.
Despite all this, a new face comes into his life. A being who happens to be more powerful then Arceus, yet didn't even know it until recently. Ash learns the truth behind his world and the events that were meant to be.