Lena is a Pokémon Trainer traveling in the Kalos region.
Bonnie randomly walked up to
Lena at a Pokémon Center near Shoyo City and asked her to marry her brother
Clemont.
While talking to an acquaintance, her younger sister
Lyn went looking for Pichu who was in a pochette that got mixed up with
Bonnie's pochette at the Pokémon Center.
Lyn feared her sister
Lena would be mad.
Lena went searching for
Lyn 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
Lyn and
Lena. Both the Pokémon were returned to their owners. She then had a meal with
Ash Ketchum and his friends.