Professor Jacuzzi's job was to stop all of the Gulpin from eating all of his town's food supplies, which they did annually. The professor's first plan involved a giant Pokéblock to lead the Gulpin away. However, Team Rocket ended up stealing the Pokéblock and the Gulpin chased them out of town. The Gulpin then tried to escape through the sewer and emerge onto the street. Professor Jacuzzi arrived with a device that beams them up and shoots them away, but it broke down with one Gulpin left to go after accidentally beaming Ash's Treecko along with the last Gulpin.
Gulpin used Spit Up while inside the machine, which reacted with the particles and made both Pokémon become as tall as buildings. The two then continued their battle, although Treecko eventually returned to its normal size. Professor Jacuzzi, meanwhile, caught the Gulpin with a Heavy Ball.
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| Gulpin is Professor Jacuzzi's only known Pokémon. This Gulpin first appeared among a large swarm of Gulpin that swarmed his town in Gulpin it Down!. When Professor Jacuzzi used his particle cannon to rid the city of the Gulpin, this Gulpin was the last one remaining. However, at that point, the professor's machine broke down. Once he got it working again, however, he accidentally absorbed Treecko, along with the Gulpin, as the two were battling at the time.
Due to Gulpin's use of Spit Up, both Pokémon grew to gargantuan proportions. Treecko and Gulpin continued fighting in the city until Treecko returned to its proper size and Professor Jacuzzi attempted to capture Gulpin. He first used a regular Poké Ball, but it failed. He then threw a Heavy Ball, which succeeded in catching the gigantic Pokémon. Although certain that catching it would have returned Gulpin to normal size, the professor discovered upon sending out his newest Pokémon that it was still giant. Although he promised Ash and his friends that he would find a way to return Gulpin to its normal size, it is unknown if he has succeeded.
|Debut||Gulpin it Down!|
|This article is part of Project COD, a Bulbapedia project that aims to write comprehensive articles on each one-time character of the Pokémon anime.|