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The Gym Leader is Edie, a former Pokemon Center nurse who decided she needed more excitement in her life. She's the warden and lead physician of her home region's biggest Pokemon preserve, a facility inspired by Kanto's Safari Zone. She's a plump, older woman in khaki survival gear who takes joy in being responsible for the medical well-being of every Pokemon in the park. She's sweet, but no-nonsense and to-the-point.
Her 'gym' is the Safari area itself. The gym challenge involves catching wild Pokemon Safari Zone style so they can be administered medicine. She'll judge your Pokemon care skills accordingly.
She's a Normal-type specialist who uses a variety of sub-types to create a balanced team. Beat the doc and you get the TM for Hyper Voice and the Safari Badge.