Ash, Iris and Cilan arrive at a small village as night falls and they find it deserted. They make there way to the pokemon centre and make it in just before Nurse Joy locks the doors
Joy reveals the village is haunted by the ghost of a Mr Mime who wonders the streets at night and haunts the ruins of a nearby castle by day. Joy then says the towns Officer Jenny went to investigate the castle 2 days ago but hadn't returned.
Later that night Ash wakes up to find Pikachu gone. He wakes Cilan and they go to look for him. As Cilan goes to check with Iris while Ash heads downstairs. In the main room he sees Pikachu and Axew sat staring through the Windows. Ash looks and sees a pale Mr Mime shuffling along.
The next morning he tells Joy what he saw and Joy says that was the ghost. Ash decides to check out the castle and Cilan & Iris tag along.
Arriving at the castle the trio split up to look for Clues. Iris and Axew find a room full of gold but are captured by the ghostly Mr Mime.
Hearing her screams for help Ash rushes in and orders a thunderbolt from Pikachu, which shocks Mr Mime and knocks it out.
Just As Ash frees Iris from the cage she's in Cilan comes in with Officer Jenny, who he found locked in a room. Jenny reveals the ghost is a fake and is actually a man disguised as a ghost stealing treasure from the Castle, treasure that rightfully belongs to the village. Ash walks over and pulls the mask off Mr Mime, revealing a thugish looking man.
Later on he is lead away he looks back and cries "I would
have gotten away with it too,
if it weren't for you meddling
kids and your dumb Pikachu"