She approached the group after Pikachu had become tired after Team Rocket's failed attempt at stealing it. Krystal told Ash and his friends that she could lead them to a place where Pikachu could get better, but she made Ash promise he wouldn't tell anyone where it was. She escorted the group to a mountaintop lake with a legendary crystal that could cure the ailments of all Electric-type Pokémon.
Team Rocket then tried to steal the crystal, when a Zapdos appeared and attempted to stop them. However, the legendary Pokémon was injured and could not be healed because the crystal was stolen. Luckily, Ash and his friends retrieved the crystal, and with the help of Pikachu and the other Electric Pokémon, Zapdos fully recovered. Ash and the others said goodbye to Krystal and once again promised her that they would not reveal the location of the lake to anybody.