Pokemon: Season 1, Episode 20

1 - 20: The Ghost of Maiden's Peak

Landing at a small town Brock and James spot a ghostly girl standing by the sea. She then disappears and they are curious to find out who she is. However they learn that the girl was turned to stone a couple of thousand years ago and she still awaits the return of her love. This girl will only lead them to a cruel fate they are warned. It turns out that the ghost is actually a Gastly pretending to be the maiden.