Calista appeared to be very enthusiastic about archaeology and Pokémon. However, her parents refused to support her decision to pursue this career. One day, she received a phone call telling her to go and locate a "Baltoy's path", following the lyrics of a song, on Kirikiri Mountain with her Baltoy.
With Ash's help, they located a mysterious woman in the tree hollow, and she guided them through to the Baltoy civilization ruins. The woman pointed to a magic wheel, adding that her Baltoy was trapped under a large number of boulders. Calista used her Baltoy to free the mysterious woman's Pokémon. Following orders, Calista then used her Baltoy's Rapid Spin to reveal the magic wheel's time travel abilities. The mysterious woman finally revealed her own identity as Calista, but from the future. She encouraged her past self to pursue her ambitions before returning to her own time.
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Baltoy was first seen spinning around and heading towards a cliff, though Ash's Pikachu used Quick Attack to stop it. Later, it helped future Calista's Baltoy, in other words itself, by removing the rocks that were crushing it. Baltoy later used Rapid Spin on the magic wheel, allowing future Calista to return to her own time.
Xatu is a Pokémon owned by future Calista. She first used it to battle Team Rocket, sending them blasting off with a Shadow Ball.
Later, she used it to protect Ash and present Calista as Baltoy dealt with the fallen rocks hiding the magic wheel and rescued future Calista's Baltoy. Xatu also tried to battle with one of Team Rocket's mechas, but was unable to defeat it. After Baltoy damaged the drill machine, Xatu sent the trio blasting off with another Shadow Ball.
Carmen Cervantes (young) Yolanda Pérez Segoviano (adult)
In the manga
Calista in Ash & Pikachu
In the Ash & Pikachu manga
Calista appeared in Hunt For The Treasure Of The Universe!. Ash met her when her Baltoy was spinning around. She showed him a magazine and told him about his dream of becoming an archeologist but her parents refused to support the decision. The lady that Ash saw by the tree before takes him and Calista to the tree hole which led them underground. Using Baltoy, it lifted a pile of boulders out of the way and uncovered a drawing of a Baltoy.
After a battle with Team Rocket, the lady revealed herself to be Calista's future self and stood on the painting as it took her back to her own time. Calista and Ash left the tree and waved their farewells as Ash reunited with his friends.
Baltoy is Calista's only known Pokémon. While underground, it lifted up a pile of boulders and battled Team Rocket.