Hiiragi

Rochelle is a character of the day who appeared in Roll On, Pokémon! (EP122). She lives in a valley located between New Bark Town and Cherrygrove City, where she finds precious amberite, with the help of her Donphan, to supply local artisans, collectors, and jewelers.

As Ash was attempting to catch one of Rochelle's Donphan, not knowing it already belonged to her, she stepped in front of the battered Donphan and declared that it was enough, and that she should report them to Officer Jenny. Brock then approached Rochelle romantically, asking what her name is, with Rochelle subsequently telling him. Brock noticed the necklace she wears, and noted that it was beautiful. Rochelle thanked him, and told him it is amberite. Throughout the episode, Rochelle was clearly uncomfortable by Brock's advances, and maintained her distance from him.

Rochelle cares deeply for her Pokémon, and was frantic when Team Rocket stole her untrained Donphan. She also trusts them immensely, allowing them free reign and uses a whistle to call for their assistance. Rochelle has an eye for detail and was able to perfectly describe Donphan's kidnappers to Ash and his friends.

(Source: Bulbapedia)