Mariah is a character of the day who appeared in Lights, Camerupt, Action!.

Mariah lives in a small town in Hoenn that doesn't have a movie theater. As a result, she developed a friendship with Elijah, who uses his Camerupt to bring movies to small towns and have viewings for them. The first time Elijah came to her town, she was so impressed with him that she wrote a letter to him, asking for him to return with a new film.

While she anxiously waited, Elijah and his Camerupt were aided by Ash and his friends. They fought off Team Rocket and helped get the film to Mariah and all of her friends. Once again, she was very happy and impressed with her friend for making such an incredible journey.