Kanna

Lorelei is the first Trainer of the Kanto Elite Four in Generations I, III, and VII. She is known for her logical, calculated, and cool style of battling. Her Lapras has been with her ever since she was a child. She caught it when she was very young in the Icefall Cave. Misty idolizes her.

Her name was changed to Prima in the English dub of the episode. According to 4Kids, this was to fit the number of syllables; the English name "Lorelei" is three syllables while the Japanese name "Kanna" is only two. In this episode, the dub referred to Prima as a Pokémon Master rather than an Elite Four member.

(Source: Bulbapedia)