Lily recruited Ash and his friends to search for the ingredients she needed for a spell that would let humans understand the speech of Pokémon. Her ancient spell book is a family heirloom passed down for hundreds of years. Lily is able to read the ancient script inside her book which dates back to the third King of Pokémania. However, when she actually got to perform that spell, she accidentally turned Ash into a Pikachu. Ash wasn't too concerned after learning that the magic was only temporary, and he returned to his human form in As Clear as Crystal.
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Murkrow is Lily's only known Pokémon. It helped Lily with her spells and was mostly seen sitting on her shoulder. It first appeared when it found Ash and his friends so that Lily could use Pikachu's Thunderbolt in a spell. It then helped Ash blow away Parasect's Sleep Powder before Team Rocket's attack. Team Rocket stole Pikachu, but were blasted off when Murkrow pecked a hole in their balloon.
Later, Team Rocket stole Lily's spell book. Murkrow tried to stop them again but was knocked out. When Team Rocket was found, Murkrow defeated Arbok and Weezing to send them blasting off once again.