From Bulbapedia, the community-driven Pokémon encyclopedia.
Katrina (Japanese: クミコ Kumiko) is a character of the day from the Pokémon anime who appeared in Time Warp Heals All Wounds.
She is the granddaughter of Edna and Jonathan. She told May that her grandfather had gone away and never came back, and that her grandmother had lost a very important amulet in that time.
After May and Meowth rewrote history, she appeared as her grandparents' helper in care of baby Pokémon.