The Marowak and her child Cubone used to live peacefully until Team Rocket began poaching Pokémon in the area. The Marowak ghost appeared in File 2: Cubone, where she played the same role that she does in the games, warning intruders to stay away. Her child Cubone calms her spirit, and she departs. In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, after the player reveals her with the Silph Scope, she does not battle. Once she is defeated, her soul is calmed, and she departs to the afterlife, granting the player passage to the top floor.

Despite being a wild Pokémon, she avoids all thrown Poké Balls (even while sleeping).

In the Generation I games and Pokémon FireRed and LeafGreen, the player has to battle her to calm her down. She appears as a ghost that prevents the player from ascending to the top floor until they obtain the Silph Scope to identify her. As a result, the Marowak's ghost remained in the Pokémon Tower, forbidding access to the topmost floor. The Cubone escaped, but its mother was killed. One Cubone, however, was protected by its mother. In the Generation I core series games, Pokémon FireRed and LeafGreen, and Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, before the player reaches Lavender Town, members of Team Rocket invade the Pokémon Tower and attempt to steal the skulls of Cubone in order to sell them for large amounts of money. Marowak's spirit being calmed by its child in Let's Go, Pikachu! and Let's Go, Eevee!

How to get past ghost in pokemon tower