• English / United States: Katharine
• Japanese / Japan: コハル
• Japanese (Romanized) / Japan: Koharu
• Japanese (TL) / Japan: Koharu

Katharine is a Pokémon Trainer that has a very selfish Gothita. Katharine and Katharine's Gothita form a combo and are now visiting gyms in the Unova region. At the time she met Ash Ketchum and his friends, Katharine had two badges: the Basic Badge and the Insect Badge. Katharine tends to follow the will of her Gothita and spoils it a bit by abiding by whatever it wants to do despite her initial thoughts and reactions to a situation.

When Katharine's Gothita decided that it liked Ash's Scraggy, Katharine's Gothita instructed Katharine to send out all her Pokémon so Ash Ketchum could decide which one of her Pokémon he'd trade with. When Ash Ketchum said he wasn't willing to trade, Katharine's Gothita got upset and in order to please it, Katharine's attitude changed as she tried to persuade Ash Ketchum by playing to his vanity. After numerous suggestions that Ash Ketchum was a weak opponent, Ash Ketchum agreed to battle against Katharine and if he lost he would trade his Zuruggu. Katharine lost the battle though and Ash's Scraggy wasn't traded to her but Katharine's Gothita got really mad at her for loosing.

Despite submitting to Katharine's Gothita selfish attitude, Katharine seems to be a nice trainer and was planing to head to Raimon City next as she was a big fan of Elesa. Katharine was last seen chasing after her Gothita as it ran off into the distance after it lost the battle against Ash's Snivy.