This Pansear belongs to Chili of the Striaton City Gym and made its first appearance in BW005. It was the first of the three brother's Pokémon which Ash battled. It went up against Ash's Tepig and was defeated, despite Chili thinking he had the advantage because it was a fire type against a fire type and it was Ash's first battle with Tepig.
It was also seen in BW060 when Cilan battled with Chili, but Pansear ultimately lost. It then battled Ash's Oshawott and won due to Cilan helping Chili and Pansear train.