Vincent has a crush on Marina. Knowing Marina admires people who wear capes, Vincent dresses up in a cape sometimes to impress her. He has also used different personae in a bid to impress her. While it is disputed whether Jackson was one, he called himself Fabu-Vinny in The Legend of Thunder!, as Marina calls LanceFabu-Lance. Vincent sees Jimmy as a rival for Marina's attraction, which is not unfounded as QuestShipping is near-canon.
As Jackson, he first appeared in Tie One On!, where he battled Ash during the final battle of the preliminaries of the Silver Conference. The match ended in a draw, but Ash proceeded to the next round based on points, since Jackson had lost his previous match.
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Jackson's Azumarill's only appearance was in Tie One On! where it first appeared when an apple in a tree which Ash's Bulbasaur and Squirtle, and Vincent's Meganium and Azumarill fancied. Bulbasaur and Meganium used Vine Whip to fetch the apple, and they pulled to try to get it, but in the end, the apple snapped in half. Everyone was happy until Azumarill threw the apple at Squirtle, thinking it was funny. Squirtle was about to fight Azumarill until they stopped, but Meganium tripped Bulbasaur up and they both started to fight. Suddenly, Harrison used his Miltank's Heal Bell to calm them down.
It appeared later in the Silver Conference against Ash, and Pikachu. Azumarill started with a Water Gun and Pikachu used Quick Attack. Pikachu went for a Thunderbolt while Azumarill used Bubble Beam. It then went for Icy Wind hitting Pikachu, followed by Iron Tail. Pikachu grabbed onto its tail, however, and used Thunder, fainting Azumarill.
Jackson's ShinyMagneton made its sole appearance in Tie One On!. It proved to be very powerful and strategic. Jackson sent it out to battle Ash's Pikachu. After a long battle, Magneton finished Pikachu off with a Tri Attack, then went on to defeat Cyndaquil without a problem, before finally falling to Bulbasaur.
Jackson's Poliwhirl's only appearance was in Tie One On! where it battled against Macy in Group H against her Quilava. Quilava started off with a Flamethrower, while Jackson was about to call an attack too. He tripped over his cape however, causing the Flamethrower to hit his Poliwhirl and fainting it, giving Macy the win.
Vincent's English name change may come directly from Pokémon Gold and Silver. There is a minor Trainer named "Junichi" in the Japanese version whose name was localized as "Vincent" in the English translation - a Guitarist in the Vermilion CityGym with three Magnemite and a Voltorb. The dubbers may have mistaken this character for an unrelated anime character. The same thing happened to Jimmy.
Vincent is shown to have a crush on Marina, who likes men who wear capes. When he was first seen in the main series, he was wearing a cape while battling Macy in Tie One On!.