The Mysterious Rain Shelter! Nyasper Is Watching!!

Our heroes and the Rocket-Dan all seek shelter from a downpour in an old, abandoned mansion. When lights come on and doors close behind them, they're convinced the mansion is haunted. Our heroes encounter a mysterious being with glowing eyes, and Satoshi, Serena, and Citron are terrified--but Eureka runs after it and ends up making a new friend: a Psychic-type Pokémon...