Kathryn

Kathryn and her sister Audrey are a bubbly duo of girls who are often seen giggling to each other. They work perfectly together as a team, and on occasion, they speak in unison. The twins have a close bond with their Pokémon and speak highly of their older brother Rafe's skills as a Trainer, as well as his Blaziken's battling skills.

(Source: Bulbapedia)