Alder's Bouffalant debuted in Ash and Trip's Third Battle! in Trip's flashback. In years prior, Trip had attended a street fair where Alder was making an appearance. The Champion was engaged in a battle with a Herdier using Bouffalant, which he won using Bouffalant's powerful Head Charge. Following the battle, Trip introduced himself to Alder, and Alder allowed the boy to pet Bouffalant and give it some food from his hand.
Bouffalant and its trainer made another appearance in BW052, this time in person. When Ash and Trip encountered Alder just outside Nimbasa City, he challenged the two to a battle, which he initially proposed would be two-against-one. Trip, however, was disgusted by what he saw as his idol's change in personality from his serious demeanor in their first meeting, and stormed off. Ash accepted Alder's challenge, and sent Ash's to battle Alder. Though Ash and Pikachu fought seriously, however, Alder dozed off during the battle, resulting in it being called off. Irritated by this, Bouffalant attacked him with Head Charge and rammed him into a tree, but calmed down when Alder gave it an apple. Later, Alder sent Bouffalant back out to face a rampaging Gigalith, but quickly decided to deal with the problem himself instead.
Bouffalant is shown to take battles seriously and has a bit of a temper, but has an affectionate side as well, seen when it allowed Trip to hand-feed it and when it licked Alder's face after eating an apple he gave it.
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