Ep 25. From Ghost to Ghost

Ash and friends enter a haunted house while trying to make their way to the next gym, not realizing the ghostly dangers that await them. Inside the house, they meet a young girl named Mina who thinks Pikachu is adorable. Mina tells them that the house is haunted by the ghost of a young boy who died there years ago, and she is trying to help him move on to the afterlife. She believes that the only way to do this is by making contact with his spirit.

Ash and the gang decide to help Mina, but things take a turn for the worse when they accidentally break a vase which was supposed to be used to summon the boy's spirit. The broken vase releases a swarm of ghost-type Pokémon that swarm the house. Mina's elderly grandmother, a powerful psychic, uses her abilities to help Ash and company fight off the ghosts. They eventually manage to capture the one who had possessed the vase.

As they explore the house, Ash and his friends discover that it holds many secrets, including a hidden door leading to a secret laboratory. There, they find documents revealing that the house was once owned by a mad scientist who experimented on Pokémon, including the young boy's favorite Pikachu. They learn that the boy had been trying to rescue Pikachu from the laboratory when he died.

The group realizes that the boy's spirit will not rest until he knows that Pikachu is safe. Determined to help him, they embark on a mission to rescue the Pikachu from the laboratory. Along the way, they are faced with more ghost-type Pokémon, but with Mina's help, they manage to capture them all.

Finally, they reach the laboratory, where they find the traumatized Pikachu. They free him and take him back to the haunted house where they reunite him with the ghost of the young boy. With tears in their eyes, they watch as the boy's spirit fades away, knowing that they have finally helped him find peace.

In the end, Mina and her grandmother thank Ash and his friends for their help. As they leave the haunted house, they realize that they have all grown stronger from the experience and have formed a deeper bond with each other and the Pokémon they had fought alongside.