After both Ash and Pete had lost a Pokémon each in their third round battle in the Kanto Pokémon League, it was down to a battle between Pete's Cloyers and Ash's Kingler.
They both approached each other slowly before Ash order Kingler to use a crabhammer to which Pete ordered his cloyers to withdraw into its shell. Despite Cloyster being withdrawn in its shell Kingler kept on using its crabhammer attack and eventually managed to put a crack in Cloysters shell which made it unable to battle any further.
Pete recalled Cloyster and sent out Arcanine to try and win the round.