Thehaunted Mansion Part 1

Ash lost to Gym Leader Sabrina. He's then told that he'll probably need a Ghost-type Pokémon and that the best place to catch one is at the remote mansion. When the friends arrive, Misty feels a cold shiver and something touches her chest. Before she knows it, she's in the middle of a Ghost-type frenzy. Just when she thinks it's over, the leader of the Pokémon suddenly appears: a gigantic, monstrous Gengar. Naturally, the Gengar wants to join in the fun too. Ash and Brock have found Misty and join the frenzy as well.