In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, Lorelei appears on Route 10 when the player is attacked by a group of Team Rocket Grunts and helps them defeat them. She also collects stuffed Pokémon dolls that she keeps in her house on Four Island. She returns to her home to protect the Icefall Cave from Team Rocket during the post-game.
In Pokémon FireRed and LeafGreen, it is revealed that Lorelei grew up on Four Island. She caught it when she was very young in the Icefall Cave. Her Lapras has been with her ever since she was a child. She is known for her logical, calculated, and cool style of battling. Lorelei is the first Trainer of the Kanto Elite Four in Generations I, III, and VII.