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She is a knowledgeable researcher who also works as an assistant to Professor Magnolia, her grandmother and the Galar region's Pokémon leader. She is also a childhood friend of Lionel, the region's Pokémon League Champion. Late in the game, her grandmother approves of her and gives her her robe, making her his official successor as Pokémon Professor. Her field of study is based on the history of Galar, and she even publishes her discoveries on her journey. Sonia is a young, slender girl with red hair, fair skin, and aquamarine eyes. Her hair is covered with silver heart-shaped ornaments and worn in a large ponytail. She wears an aquamarine blouse and light blue jeans, and a short beige trench coat. She carries a black purse and shoes the same color as her blouse, both also decorated with silver hearts. She also wears black sunglasses with orange lenses and a large bracelet. Her nails are long and painted aquamarine. She has a habit of playing with her hair. Very helpful and knowledgeable, Sonia provides practical advice to aid the player on their journey. While very friendly, she often becomes exasperated with Lionel's antics, especially his tendency to keep his head in the clouds. She is also not afraid to speak her mind, as shown when she berates Tizonio and Dargo later in the game. However, while mostly mature for someone, Sonia actually doesn't mind acting childishly around those younger than her. Sonia is the granddaughter and assistant of Professor Magnolia. She is also Lionel's childhood friend and rival. She used to be a trainer and alongside her partner Pokémon, Yamper, participated in Gym Challenges alongside Lionel, but eventually decided to retire. She seems to have regretted her decision, as while Lionel eventually became the Galarian Champion and a world-famous celebrity, Sonia became little more than an assistant. Sonia spends most of the adventure helping the player while also figuring out what she wants to do with her life, eventually choosing to seek out the truth behind the legends of Galar's first king and the Darkest Day. Together with the player and Paul, she discovers the existence of Zacian, Zamazenta, and Eternatus; and publishes her findings in a book, a feat that helps her gain recognition as a professor like her grandmother. By the end of the adventure, Sonia takes her grandmother's place and becomes Galar's new professor.