She is a kind-hearted trainer, but is constantly manipulated by her Gothita. Seeing her Gothita having crush on Ash's Scraggy, she challenged Ash to a battle with the condition that if she won, she would take Scraggy for Gothita. However Ash managed to defeat her Mandibuzz and thus saved his Scraggy. After the battle, Katharine took shelter with the heroes and took a nap, but was worried about her Gothorita, who ran away with Scraggy and Axew. After Gothorita and the others were found and rescued from a Garbodor, Katharine had a fight with Ash, using Gothorita against Snivy. Snivy managed to defeat Gothorita, who ran away, while Katharine followed her.
Season 16: BW Adventures in Unova
She appears in a Pokémon Center at Unova League, with her Minccino.
Katharine's Gothita is very bossy which really liked Scraggy. Due to that crush, her trainer challenged Ash to battle.