Brock has joined Ash and Misty, as they continue on their path to Pokémon greatness. First, they must find a short cut to Cerulean City, through the caves of Mt. Moon. Upon reaching Mt. Moon, our heroes witness a young researcher being attacked by a large number of Zubats. With Pikachu's electric shock, they rescue the researcher at the mouth of the caves. Full of gratitude for their assistance, the researcher, Seymour, offers to guide them through the caves. Along the way they witness many injured Pokémon. The poor condition of these Pokémon has been brought about by explorers searching for a Moon Stone reported to exist somewhere within the caves of Mt. Moon. These precious stones posses the capability of 'powering up' Pokémon. As more and more people come in search of these stones, the natural habitats of the Pokémon have become worse and worse leaving the Pokemon to fight for their daily survival. With the help of a group of the Pokémon Clefairy, our heroes defeat Team Rocket and witness the legendary Moon Stone work its magic on these enchanting Pokémon.