Marcia is first seen in the back of her father Duking's house in Pyrite Town. She is part of the underground rebellion against Miror B. and plans to recover Duking's stolen Plusle.
Her role is greatly expanded in Pokémon XD. Marcia has now become a reporter for ONBS and has a reputation for being reckless. She and her cameraman, Cameran, are encountered leaving Pyrite on Michael's first visit en route to a news story at Phenac City. However, when she fails to come back, Michael is sent to find her. Marcia and Cameran are eventually found being held hostage by Snattle in Phenac Stadium, where the Cipher Admin is trying to intimidate her into handing over their videotapes of the evil activities within Phenac. As Michael fights Snattle, Marcia and Cameran tape the battle and later run it on ONBS, exposing Cipher to all of Orre.
Later, she can be found outside the Cipher Key Lair, where she and Cameran are reporting on Chief Sherles's plans to arrest the Cipher members inside.