The Yas Gym is in competition with the Kaz Gym to become the official Gym of Dark City so that he can earn money. After Ash refused to join his Gym, he tells his recruit to attack Ash with their Pokémon, in order to prevent him siding with the Kaz Gym against him. Later, the two Gyms rendezvous, and he sends his Scyther out again. During the fight of his Scyther against Kaz's Electabuzz, Ash, his friends, and a group of local children spill ketchup on him, Kaz, and Team Rocket. As both Scyther and Electabuzz have a strong aversion to the color red, these two battling Pokémon turned on their Trainers.
After their Pokémon run into each other, the two Leaders go after Ash, Misty, Brock, and the three kids who helped them. Pikachu then fends them off with a Thunder. When Nurse Joy, acting as an official of the Pokémon Inspection Agency, tells them that Ash, who is known by them as Tom Ato, will be their teacher, Ash tells them to restore the town, which they eventually do.
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Scyther is Yas's main Pokémon. Like the other Pokémon of its species and Electabuzz, Scyther doesn't like the color red. It was first seen when a female recruit of the Yas Gym brings Ash and company to the Yas Gym. Yas tells Ash to prove his strength and commands his Scyther to fight Pikachu. Sending its scythes out, it attacks the ketchup bottle Pikachu was holding, sending the ketchup at its eyes. With its eyes covered, Scyther then attacks its Trainer in a frenzy due to seeing everything as red, resulting in Yas having to return it to its Poké Ball. Later, when the two Gyms fight again, he sends Scyther back out. It, when surrounded, uses its Swords Dance attack and slices a building with Team Rocket on it. When its Trainer is covered with ketchup, Scyther starts to attack him again. After Ash, Misty, and Brock think they have had enough, they spill ketchup on Scyther and Electabuzz as well. Upon seeing their reflection in the other's eyes, they run into each other. At the end of the episode, Scyther and Electabuzz chase Team Rocket whom are now covered in red paint as well.