From Bulbapedia, the community-driven Pokémon encyclopedia.
Just not interrupt me... I am trying to make a line for the team of my imaginated perfect character. An unbeatable Pokemon master.
He comes from the snowy Sinnoh region and he was in the same school class as James. When the city was attacked with Team Rocket's previous duo, an interestig Black Haunter attacked them and switched their minds. Soon, Black Haunter befriended Ade Tyshio, while James decided to rather follow the Team Rocket.
After Black Haunter allowed Ade Tyshio to do that, Ade used his special Duskball and caught Black Haunter, which became his first Pokemon. After Ade's mother, Jeanne, allowed him to go on his Pokemon adventure, he registered to the Sinnoh League and gone ahead, with hope to be an unbeatable Pokemon Master, the best of all.