A self-proclaimed "fishing god", Sullivan's ultimate goal is to capture a Whiscash named Nero. He has an extensive collection of fishing lures and rods. For 50 years, Sullivan tried countless times to capture the Pokémon, but he has always failed. He hoped that with the help of Ash and his friends, he would finally achieve his goal. Ash wanted to capture Nero as well, since the Pokémon had eaten his Badge case.
Although Sullivan described himself as a fishing legend, it was Ash who finally caught Nero on a fishing rod, managing to force it onto land and weaken it with Grovyle's Pound attack. After a foiled attempt at capturing Nero by Team Rocket, Sullivan sent out his Flaaffy, [nickname]]d Hannah, against Nero and decided to use his secret weapon: a Master Ball. He threw it, but the Water/Ground Pokémon opened its mouth and ate the Ball.
Although stunned that his Master Ball had been eaten, Sullivan remained optimistic, vowing to never give up on trying to capture Nero, claiming that the hunt would always be exciting for him. Wishing Ash luck on his next Gym battle, he said that they were welcome to stop by whenever they felt like fishing.
|Hannah (Japanese: ハマちゃん Hama-chan), Sullivan's Flaaffy, is Sullivan's only known Pokémon. Sullivan sent out Hannah in order to weaken Nero. After using several different attacks, Sullivan told Hannah to use its Thunder Shock attack, which failed due to Nero being part Ground-type. It was at this point that Sullivan tried to use his Master Ball to capture Nero.|
|Debut||Whiscash and Ash|