Pokemon Season 1 Episode 13 - Mystery at the Lighthouse

⁣When the Krabby that Ash catches disappears, he goes to a nearby
lighthouse to see if it reached Professor Oak's lab. The keeper of the
lighthouse is Bill, a Pokémon Watcher who is searching for a mysterious
Pokémon. Bill teaches them about Pokémon and they get to see a
mysterious Pokémon.