Lenna is a Pokémon Trainer traveling in the Kalos region. Bonnie randomly walked up to Lenna at a Pokémon Center near Shoyo City and asked her to marry her brother Clemont.

While talking to an acquaintance, her younger sister Lim went looking for Pichu who was in a pochette that got mixed up with Bonnie's pochette at the Pokémon Center. Lim feared her sister Lenna would be mad.

Lenna went searching for Lim and her Pichu after she realized she wasn't with her anymore. They were reunited with the help of Clemont and his friends who were also looking for Lim and Lenna. Both the Pokémon were returned to their owners. She then had a meal with Ash and his friends.