Bunnelby is a friendly, tough and patient Pokémon. Like Chespin, Bunnelby has a friendly, kind, and happy go-lucky personality. But unlike his friend Chespin, Bunnelby is more mature, and like Clemont, can get nervous when in front of the camera. When Bunnelby performed an act of kindness to Serena's Eevee in the episode A Frolicking Find in the Flowers in the form of letting Eevee sneak off with a PokéPuff and to Chespin's dismay, letting him take the blame, Serena's Eevee began to trust Bunnelby, and at the end of the episode, revealed that it was Bunnelby who she was most comfortable with.
Clemont caught Bunnelby before he and Bonnie met Ash and Serena, where it was ordered by a Diggersby, a leader of a group of Pokémon, and when they found the problem, they all worked together to get out the subway.
Bunnelby was used by Clemont in his first battle against Ash and Pikachu. Bunnelby was shown to be a strong battler, easily dominating the first part of the battle until it made the mistake of clamping Pikachu's tail with its ears. Pikachu responded with an Electro Ball, which dealt Bunnelby a lot of damage. Before the battle could continue from there, Team Rocket attacked and tried to capture Pikachu and Bunnelby. Clemont had Bunnelby using Mud Shot against Wobbuffet so Pikachu could attack with Electro Ball. However, Wobbuffet managed to dodge Bunnelby's attack. After Froakie appeared and stopped Wobbuffet with its bubbles, Bunnelby used Dig to propel Team Rocket into the air so Pikachu and Froakie could send them blasting off with Thunderbolt and Water Pulse respectively.
Clembot, also the Gym Leader Clemont built, made a deal with Clemont: If Bunnelby defeated Heliolisk, Clemont can reset the robot. When Bunnelby was utilized, it was being knocked around by Heliolisk's Bulldoze & Parabolic Charge attacks. At the end, Bunnelby won the battle with Dig and Mud Shot.
Bunnelby was used in a practice double battle with Chespin against Ash's Froakie and Ash's newly-captured Hawlucha. During the battle, Froakie and Hawlucha got into an argument with each other. Although Bunnelby and Chespin got the upper hand, Froakie used its speed to confused them both and defeated them single-handedly.
Bunnelby was used as the first Pokémon Clemont chose in the gym battle against Ash. But just like on the day Ash met Clemont, Bunnelby battled against Ash's Pikachu. During the battle, Bunnelby revealed to have learned Wild Charge, but despite putting up a good fight, Pikachu overpowered it and defeated Bunnelby, giving Ash the first win against Clemont.
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|Dig +||Kalos, Where Dreams and Adventures Begin!|
|Double Slap +||Kalos, Where Dreams and Adventures Begin!|
|Mud Shot +||Kalos, Where Dreams and Adventures Begin!|
|Double Team (move)||Clemont's Got a Secret!|
|Wild Charge +||The Moment of Lumiose Truth!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
Bunnelby is the first Pokémon to battle Pikachu in the Kalos Region.