Ash, Misty, and Brock encounter a gigantic Magcargo that refuse to step aside and let a traveller pass. When Misty's Water tactics fail to move the stubborn Fire Pokémon, a passing trainer taunts her, declaring that Fire Pokémon, his specialty, are far superior to Water. Their rivalry escalates into a full-on Pokémon battle.

When Pikachu is left exhausted in battle, the gang meets a trainer who guides them to a secret, yet legendary lake that somehow serves to restore energy to the Electric Pokémon that live along its banks.