Mikoko

Calista is a character of the day who appeared in Xatu the Future (EP236). She is a thirteenth-generation Xatu prophetess from a small village located between Ecruteak City and Mahogany Town. Calista typically announces the weather forecast.

Ash, his friends, and Team Rocket fell through one of Team Rocket's pitfall traps and discovered Calista's civilization. Calista rushed past them on her way to her next prediction ceremony and urged everyone to follow her. There, she predicted it would be a sunny day, but rain began to appear. Concerned, Calista ran back to her secret weather station. She scoured through her data again but was unable to disregard her Xatu's prediction that a great flood would arrive tomorrow. Calista faced a dilemma because she was unsure whether she should alert the town or not. In the end, she told the town that the Xatu had predicted a terrible storm.

As a result of the prediction, the villagers offered their belongings toward her three Xatu and then fled. The Xatu Teleported Calista, Ash, and his friends away from danger. Calista released the Xatu and became a weather reporter for a TV station.

(Source: Bulbapedia)