Taillow was caught by Goh during his visit to the Hoenn Battle Frontier in Serving Up the Flute Cup!. Afterwards, Goh got really excited about his new capture, which Hodge mocked him for, saying Goh shouldn't get excited over such a common Pokémon like Taillow. Later, Goh used Tailow to hunt for Wurmple as he wanted to catch one himself.
In Best Friend... Worst Nightmare!, Taillow noticed Goh's three Wurmple while flying around Cerise Park and started attacking them, which triggered their evolution once they began to fight back against the Tiny Swallow Pokémon.
In A Snow Day for Searching!, Goh used Taillow alongside some of his other Pokémon to find the bone of a wild Cubone, which he later caught.
In Panic in the Park!, during a food shortage, trying to find food with Spearow. When the two find Farfetch'd thinking about eating his leek, Taillow and Spearow are seen drooling over the item Farfetch'd carries. When the commotion led to Goh's Golurk going berserk and flooding the Park, Taillow joined the other small Pokémon and Pinsir to save Goh's three Cascoon.
In This Could be the Start of Something Big!, Taillow attended a surprise party hosted by the Lab members commemorating Goh and Ash's departure.
Taillow is shown to be quite aggressive, attacking Goh's three Wurmple for no apparent reason, despite the fact that they belong to the same Trainer. Nevertheless, Taillow is considerate of other Pokémon, as seen in Panic in the Park! where it and Spearow eyed some food but rather than fight over it, Taillow split it in half and shared it with Spearow.
Taillow is often seen in the Cerise Laboratory along with Goh's other bird Pokémon, most notably Spearow.