At the power plant, Agatha had her Arbok and Golbat attack Evan, who tried to rescue Blue.
While fighting Koga, Agatha used her Golbat to attack Blue. When Koga's Golbat used Supersonic to help Blue, Agatha's Golbat used its own Supersonic to counter the sound waves, then started attacking Blue. Since Blue was paralyzed and couldn't see, Koga threw some of his shurikens to Blue. In one of them was Koga's Ekans, who gave Blue the Parlyz Heal. Eventually, Blue returned to Koga with his Golbat, as Agatha's Golbat was defeated.
Before departing off, Agatha admitted she equipped her Pokémon, like Golbat, with a band that gave her the ability to control them. She also had Bruno wear the same band to control him as well.