Pokémon: A Roundup of Ash's Eight Masters' Peak Battles!

Ash is about to challenge the Silver Conference, the strongest trainer of the future will challenge for his first League Championship!
A legendary retrospective has arrived!
[A Roundup of Eight Legendary Trainers' Master Battles]
[Advancing to the semifinals! Steel tail? Giant Beast Slash! A strike towards victory!]
[Heading to the finals! Never giving up, that's the spirit of Super Lucario!]
[Full Power! The Strongest Rookie and the Strongest Champion!]
[Shining, 10 Million Volts VS Super Hellfire! The Birth of the Strongest Champion!]
When the eight masters finished their review, the whole world was stunned!
The strongest champion, Leon, actually lost to Ash and Pikachu!
after this……
[Chosen One, Only One! The Rainbow Feather, the Birth of the Rainbow Warrior!]
[Here we go, Greninja! The power of bonds is unleashed!]
[A mortal versus a god! Pikachu VS Tapu Koko, Ash is the champion!]
……
As the inventory continues.
The world gradually came to understand why this unassuming boy was able to defeat the strongest champion at the time, Dan!
He is Ash!