Kit first appeared as a Lickitung in Licking Lickitung, having stolen Diamond's food and Town Map. Attempting to recover it Diamond ran into the Pokétch Co. President, who insisted he help advertise his Pokétch. While advertising Lickitung showed up again in an attempt to grab more stuff and Diamond decided to capture him. Lickitung attacked Don with Rollout and followed up with a Slam, allowing Don to throw Lickitung. This enraged Lickitung and caused him to evolve into a Lickilicky. Diamond then attempted to capture him, but only ended up upsetting him more. Lickitung then burrowed underground and began attacking with Dig. Using his Pokétch Diamond figured out where Lickilicky's next spot to attack was and had Lax grab him when he surfaced. Diamond then threw a Poké Ball at him, capturing him. Afterwards the two went around town and returned all of Kit's stolen items.
In Yikes, Yanmega!, Diamond ran into a group of Yanmega being controlled by Mars that were attacking Roseanne. After assessing the situation Diamond has Kit attack with Power Whip to scatter them and find the device that is controlling them. Diamond then has Tru attack with Razor Leaf, but the attack misses, surprising Diamond. Due to this he and Kit go straight into the middle of the swarm and take one of their attacks head on, allowing Kit to grab the device and smash it. Due to the device being destroyed the Yanmega are left without instructions and leave.
Kit is a mischievous and curious Pokémon who loves to play around. He has a habit of collecting items that he finds, even stealing them if they belong to someone prior to his capture. Kit is a powerful battler and can use his long tongue to deliver strong attacks and swing across trees with great speed. Kit is also easily enraged when losing a fight and will act out aggressively. He has a strong relationship with his Trainer and shares his love of food.