The first four chapters belong to the original author here https://archiveofourown.org/works/10550948?view_full_work=true and are used with permission. The rest is my own writing.

Hopeless, sad, sorrow, heart broken, misanthropic and lonely. That's what Ash felt now, however in every darkness there is a light, shinning bright. Join Ash as he journey through different regions and compete in the legends league. Now, many of you will be wondering, how did he get betrayed, when did this take place? Well, the following is a short overview of the first few chapters in the story: After losing the Kalos league, Ash returns to pallet town only to find that most of his friends and family had betrayed him. Only Clemont, Bonnie, Serena, all of Ash's rivals and all of Ash's Pokemon remain loyal to him. Ash and his Pokemon journey to Mt Silver to train. A few months later, Ash receives a letter sent from Mr good show and Scott inviting him to participate in the legends league. All Pokemon trainers are invited including the traitors. Ash decides to participate as he wants revenge on the traitors. Despite this, many people turn on Ash in his journeys, yet many people join..............

Ash wins his 6th league in a row. (Considering that Alola doesn't exist.) Which meant that Ash won every league. He and his Kalos gang goes back, only to get a nasty surprise....

After being betrayed by his friends and his rivals, he left to Mount Silver to train and to prove that the traitors were wrong and he is not weakest among the weak. After training for 10 years, He is now very powerful. So powerful that he surpassed every living things on earth even Arceus himself and also his Mega Evolution. Let us join Ash on his journey to the tournament on how he will beat his 'former friends' or shall we say 'The Traitors' during the tournament and humiliate them.