After Dawn caught a Buizel, Zoey caught Gastrodon when it was a Shellos. Though somewhat shy, Shellos was close with Zoey, as it searched with Glameow help when she got injured. When Ash was battling in the Tag Battle with Paul, Ash recalled the combination which Glameow and Shellos used in the Hearthome Contest. Zoey used it in some of her contests, including the Wallace Cup where it defeated a Mareep.
Zoey showed her third ribbon to Dawn after the battle between Ash and Fantina. Zoey told Dawn that Shellos came through for her to win it. The heroes encountered some Shellos, who were blue, and they recalled Zoey having a Shellos but hers was pink and not blue.
Prior to the Grand Festival, Shellos evolved into a Gastrodon and Zoey used it with her Lumineon to pass the first round and then the first round of battles. Gastrodon then battled alongside Glameow in the quarterfinals to help Zoey have a place in the semifinals.
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