Daisy Oak/Manga/PA/History

Past
As a young girl, she competed in Pokémon Contests alongside.

Daisy debuted in Extricated from Exeggutor, where she was seen helping her grandfather as his new research assistant.

In Playful Porygon2, Daisy was sent to search for Blue as it was nearly his turn in the Gym Leader exhibition tournament. As she walked, she noticed that it was unusually hot, which she assumed was due to a lack of air conditioning. After making her way up the stairs, she found Blue and facing off against. After Entei escaped, Silver attempted to chase it down. When Blue tried to follow Silver, he was stopped by Daisy, who informed him about his battle against Chuck. Later, Daisy went to inform the Pokémon Association Chairman about the heat caused by Entei.

In The Last Battle XII, Hiro found Daisy and lying on the ground unconscious. Bill used his body to protect Daisy from falling rubble caused by the Masked Man's attack on the Indigo Plateau. After bandaging his wounds, Daisy helped Bill fix the Pokémon Transfer System. With it, many Trainers from around Kanto and Johto were able to send in their Pokémon to help stop the Masked Man.

After the Masked Man's defeat, in The Last Battle XIV, Daisy was shown to have become Bill's new assistant and was replaced by at Professor Oak's laboratory.

In Tackling Togekiss, it was revealed that Daisy had become a doctor. She traveled to the Sinnoh region to heal 's Pokémon, who had come down with an illness. In The Final Dimensional Duel IX, Daisy and Yanase Berlitz came to the conclusion that Platinum's Pokémon were actually infected with the Pokérus.

In Omega Alpha Adventure 11, Daisy went with and  to meet with Bill, only to find him injured after Maxie and Archie stole the  and  from him. While Red and Green chased after the thieves, Daisy stayed behind to tend to Bill's wounds.