Despite his holidaymaker aesthetic, he was brashly confident that he and his Qwilfish would defeat Misty in the first round of the Whirl Cup. Harrison even cited his years of experience as a Trainer to boast his strength. However, the young Gym Leader and her Corsola proved him wrong. At one point, Misty used her Pokémon's Spike Cannon to remove Qwilfish from its crown of thorns. Misty then moved on to her second round against Ash, and Harrison was eliminated from the competition.
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Harrison's Qwilfish first appeared in a battle against Misty and her Corsola in the first round of the Whirl Cup. Harrison ordered Qwilfish to use Water Gun which was deflected by Corsola's Mirror Coat. Seeing that this tactic wasn't going to work, Harrison told it to start swallowing water, preparing for a volley of spikes. Misty then told Corsola to use Spike Cannon just as Qwilfish used Pin Missile and the attacks collided hurting Corsola. Qwilfish was not hurt by it, however, as it had quickly dived underwater. It then used Take Down which hit. Worried that Corsola might faint, Misty ordered it to dive underwater and use Recover. However, Qwilfish had already started up another Take Down. By the time Corsola recovered, Qwilfish already zeroed in. Corsola and Qwilfish dove down. Qwilfish reappeared, but it was stuck in Corsola's horns and couldn't do much about this so it just struggled around. Misty finally got an idea and told Corsola to use Spike Cannon. Corsola fired the Spike Cannon, sending Qwilfish sky-high and knocking it out.
Harrison's Japanese name is a reference to "bari", the word for "hook". When combined with the Japanese name of the episode's other character of the day, Christopher, their names make up "fishing hook".
From ハリ hari, needle, a word present in Qwilfish's Japanese name