Kevin Kolack (Vincent)(English)
Daisuke Sakaguchi (Japanese)
Vincent, or Jackson, is a character in the spin-off Pokémon Chronicles, and also appeared as a Pokémon Trainer who in the Silver Conference from the Johto region under the name Jackson. He received his first Pokémon, a Chikorita from Professor Elm.
Jackson fought against Ash Ketchum in the Preliminary Round of the Silver Conference. Like Ash, he also owns a shiny Pokémon: Magneton. Their match ended in a draw with the final matchup being his Meganuim and Ash's Bulbasaur.
Casey started with a Chikorita, it evolved into Bayleef while saving Ash from Team Rocket in the Bug Catching Contest. It's unknown how Casey evolved Bayleef.