Pike Queen Lucy is a Frontier Brain appearing in the anime series, who is the Frontier Brain of the Battle Pike in the Battle Frontier in the Hoenn region.
Lucy is tall and very slender. She has bright red eyes and long straight black hair with red lowlights at the sides. She wears a purple halter neck crop top that shows off her stomach, long purple gloves, black pants with a gold diamond pattern around the waist, and pointy purple high heels on her feet. Her appearance is reminiscent of the Pokémon Seviper.
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Season 9: Battle Frontier
Pike Queen Lucy arrived to calm down her sister and her two friends, who had come to show Ash the Battle Pike for his Frontier Brain battle with Lucy, only to find that he was not there, having been lured into another trap by Team Rocket. When Ash escaped, Lucy personally confronted Team Rocket, pitting her own Seviper against Jessie's, which resulted in Jessie's Seviper being overpowered and Team Rocket being blasted off again. Afterwards, when Ash requested a battle, Lucy's sister reminded him that the Battle Pike is closed. Lucy, blushing, told them that the Battle Pike was always open for good friends. With that, Ash's challenged is accepted, and it would be a 2-on-2 battle. First off was Lucy's Seviper against Ash's Donphan. Despite Seviper's agility and skill with dodging Donphan's attacks, it was outmaneuvered and knocked out, forcing Lucy to send out her Milotic, which was able to take out Donphan with one Hydro Pump, forcing Ash to send in his trusty partner, Pikachu. When none of Pikachu's attacks worked on Milotic, Pikachu turned its own Electric-type attacks on itself, strengthening it, and when Milotic used Twister, Pikachu used the tornado to knock out Milotic with Volt Tackle, earning Ash the Luck Symbol for defeating the Pike Queen. After Ash and his friends leave for their next Fronter Brain, the leader of the Battle Palace, Spenser, Lucy returned home, revealing that her reasons for blushing whenever Brock was flirting with her was due to how many of her Pokemon had similar eyes like Brock's, indicating that, for once, someone returned Brock's attempts at finding a pretty girl who liked him back. Too bad Brock never knew that. 
Season 12: DP Galactic Battles
Lucy appeared in a flashback with her Milotic when Ash recalled his journey to earn every symbol from the Battle Frontier.
Seviper is Lucy's main Pokémon. It was first seen battling Jessie's Seviper and beat it easily with brute force. It was later seen in her battle with Ash when it went up against Donphan and despite seeming to have the advantage Donphan managed to pull through with some thinking on Ash's part.
Milotic is an extremely powerful Pokémon in Lucy's possession. It defeated Donphan with one Hydro Pump. It then had the edge against Pikachu with all its powerful moves like Twister, Iron Tail, and Facade until Pikachu used the energy from a twister to give Milotic an extremely powerful Volt Tackle.