MTL - My Sister is Very Obsessive - Chapter 744 : The battle between the older sister and the elementary school student

After Reincarnating into Naruto World at the Warring State Era as an Uzumaki, Masahiko thought that he got a useless System. He lived for 48 years as a normal, below average Uzumaki Shinobi.

That changed when he finally knew how the system works the day of his 49th Birthday!

- Description from Novelupdates

I am Stephen, assistant to Vegapunk. After transmigrated to the One Piece world and failing in the attempt to take down Imu in collaboration with the Revolutionary Army, I unexpectedly found myself transmigrated again, this time to the Pokémon world.Although my body has become smaller, my mind remains as sharp as ever. My current identity is:The Chief Pokémon Professor of the Pokémon LeagueA mind 500 years ahead of its timeExecutive Vice-Leader of Team RocketThe second Master-level Trainer after Professor RowanThe benefactor recognized by Rayquaza as its successorHonorary Chairman of the Alola LeagueSupreme Commander of Dark Pokémon!

Have you ever thought about how your life would turn out at the age of 18?Well before I could even say that I was an adult to even say I was going to conquer it.The world had seemed to already be determined of what mine and the rest of humanity would be when the first Leviathans was made public to our world.