The Ghost girl is a minor character from Pokémon Diamond and Pearl: Battle Dimension.
The Ghost girl made her debut appearance in the episode 'Ghoul Daze!', hiding in one of the bushes. When Conway came near the bush she was hiding in, she came out and asked Conway to play with her. At night, Conway followed her but was saved by a Dusknoir. She also tried to lure Team Rocket's Meowth with food but Dusknoir stopped her again.
After that, she made Ash and Angie follow her into the Summit Ruins. She then tried to coax Ash and Angie into the mysterious cave that was actually the entrance of the Spirit World. Dusknoir tried to stop her but Ash and Angie started to defend her. At last, Dusknoir blasted the girl into the spirit world and collapsed the cave entrance trapping her inside, apparently forever. It is not known if she would change her ways later.
- The Ghost girl appears in the book Pokémon Chapter Book #1, a novelization of the episode.