Miette first appears when she comes looking for her Slurpuff and notices Serena's Poke Puffs, in which she says they are no good, causing her and Serena to start a rivalry with each other. In order to find out who is the better baker, both Serena and Miette compete in a Poké Puff competition. Miette and Serena both make it to the Top 3, along with the Berry Baker kids and their Makuhita. The judge, Gina, later declares the Berry Baker kids the winners. Miette and Serena both vow to get stronger, and Miette whispers in Serena's ear that if Serena doesn't tell Ash how she truly feels about him, then she will confess her own feelings for him, causing Serena to blush.
Season 18: XY Kalos Quest
She later appears where she asked Serena if the reason she had cut her hair was if Ash broke her heart, and is poking at Serena through the entire episode. She along with Serena enters the Dendemille Town Showcase but loses to Serena. After the showcase she congratulates Serena on her victor but still pokes her about her crush on Ash, causing her to blush.
Slurpuff is Miette's first known Pokémon. It first appeared stealing Serena's Poké Puffs from the group using its Psychic move.