Lyn is the younger sister
Lena.
Bonnie randomly walked up to
Lena at a Pokémon Center near Shoyo City and asked her to marry her brother
Clemont.
Lyn found the situation amusing.
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.