When Lorelei was young, her Seel got poisoned from industrial pollution. Agatha approached her and had her Gastly suck up the pollution from Seel, as it was its delicacy. Seel was healed and Lorelei was grateful for the assistance. Agatha commented how dreadful things humans can do, and saw Lorelei also despised pollution. Agatha offered Lorelei to become her cohort, a proposal Lorelei accepted.
Years later, Lorelei sent Dewgong out from the edge of a cliff to attack Yellow and Bill. It used Aurora Beam, which circled them and froze the surrounding area where they were standing. She jumped onto her Dewgong and slid her way down to them as they were running away. As they were sliding on the ice, a ridge above them fell on top of them, due to Yellow using Dody to break it off. Once she cleared her head from it, they looked to see where they were, but they disappeared. When a Poké Ball came out from a hole in the ice, she had Dewgong and her Cloyster launch a joint attack, but Yellow managed to pull it back in, as it was attached to a fishing line. When the Poké Ball came back out again, she launched another joint attack, while she was sat on Dewgong. Once she saw that they escaped from behind her, she jumped off Dewgong, but got back on to attack Yellow when they stood in front of each other, while Yellow was on Dody. She attacked, but Yellow, Bill and Dody dodged it while running away again. Lorelei chased them while on Dewgong by having it use Blizzard to move. She then tried to block their way with Ice Beam, but they managed to get away by going into a river. She followed them out into it on her Dewgong.
|Aurora Beam||Do Wrong, Dewgong!|
|Blizzard||Do Wrong, Dewgong!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.