Nabi

Tammy is a young girl and a character of the day who appeared in I Politoed Ya So!. She is the leader of a Pokémon cheerleading troupe.

Her Politoed, nicknamed Bean, ran off after she scolded it for not performing properly. During her search, she stumbled across Misty's Politoed, after which Tammy decided she liked the latter more and hoped to use it for the upcoming National Competition. Meanwhile, Misty and her friends encountered Bean, though Misty was certain that it was not her own Politoed, which she later discovered practicing a cheer routine with Tammy.

After Politoed ran back to Misty, Tammy asked if she could borrow it, but Misty saw that Tammy was particularly harsh towards all of her own Pokémon, furiously yelling at them for every mistake. As a result, her own Politoed had become withdrawn and morose. Misty eventually called Tammy out on her selfish and immature actions. Tammy watched as Misty tended to her crying Pokémon, and she realized she had become fixated on winning as opposed to her actual goal of entertaining crowds. She apologized to her Pokémon, who forgave her.

Team Rocket later showed up at Tammy's dance school and captured most of the group using their cheerleading Politoed mecha. Ash, Pikachu, and Bean intervened, with Bean rescuing everyone before Pikachu used Thunderbolt to send Team Rocket blasting off. Afterwards, Tammy reunited with Bean and was pleased to see that it had picked up Misty's Politoed's own clapping rhythm.

(Source: Bulbapedia)