Calista appeared to be very enthusiastic about archeology 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 tree hole in a forest with her Baltoy. With Ash's help, they located a mysterious woman in the tree hole, but she disappeared soon after.
Following her into the hole, they found a large number of boulders, which Baltoy moved aside. Underneath, they found a badly injured Baltoy. Suddenly, the mysterious woman appeared and informed the kids that she was Calista's future self. She put her Baltoy on an altar when it fell, trapping it under the boulder. She called Calista in the past, hoping she'd help save Baltoy. After saving it, future Calista reminded present Calista not to give up on her hobbies.
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Baltoy was first seen spinning around and heading to a cliff. Ash asks Pikachu to use a Quick Attack to stop it. Later, it helped future Calista's Baltoy (in other words, itself) by removing the rocks that were crushing it. Then, it used Rapid Spin in the middle of the wheel of drawings. It is then surrounded by beams of light revealing the true identity of the woman (who was future Calista).
Xatu is a Pokémon owned by future Calista. She first used it to battle Team Rocket. Later, she used it to protect Ash and present Calista from rocks that had been destroyed by present Calista's Baltoy. It also tried to battle with one of Team Rocket's mechas, but was unable to defeat it.
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.