Goh first encountered Taillow at the Battle Frontier during his first visit to the Hoenn Region. It was spotted sitting on a tree branch before Goh captured it with a Poké Ball. Goh specifically wanted to capture a Taillow to make use of its natural hunting instinct to help him capture multiple Wurmple. After Goh was beaten in the first round of the Battle Frontier Flute Contest, Goh continued his plan to capture Wurmple with Taillow's help, and ended up capturing three of them, hoping that they would evolve into Silcoon and Cascoon respectively.
After being dropped off at Cerise Laboratory, it would later purposefully attack Goh's Wurmple due to it being the natural prey of the Taillow species. In response to Taillow's attacks, all three of the Wurmple ended up evolving into their sturdier forms. Goh watched as they evolved, still hoping that they would evolve into both Silcoon and Cascoon, but was disappointed when all three of them evolved into Cascoon. His disappointment was short-lived, as he was just happy that they had evolved at all.
Goh later decided to use Taillow to help look for a Cubone's lost bone. Upon meeting Goh's parents, Taillow proudly presented itself as one of Goh's many partners. Taillow then watched as Goh caught the Cubone after it expressed willingness in being caught.
None of Taillow's moves are shown.
At the Cerise Laboratory