Elf: I Have an Invincible Learning Device!

"I have a champion sister, but she disappeared a few years ago..." When the young man woke up, he found that he had obtained an upgraded and improved learning device, as well as an unlimited use of the Master Ball! Challenge the mythical beast, defeat the alliance, and the story of the strongest champion in history begins... [Pokemmo + fandom] The early stage is slow and can be broken in a few chapters. [This book is also called "Elves: Shadow of the Champion"]