Plot:
At the start of the episode, Misty tries to convince Ash and Brock to bypass Cerulean City and go straight to Vermilion City. She fails and says that she will wait for Ash and Brock outside of town.
Later, Team Rocket enters a building looking for something to steal Pokémon with and they find what they're looking for.
The next day Ash and Brock enter the city, then they notice that Misty is gone and Ash doesn't mind it though Pikachu misses her. Later that day, they see a crowd of people around a building and wonder what's going on. They head over and see Officer Jenny standing at a crime scene. Officer Jenny accused them of being the thieves that stole a giant vacuum machine. Ash and Brock prove to Officer Jenny that they are innocent, she lets them go. After that Brock asks Officer Jenny out on a date but she turns him down. She then tells Ash what the thieves stole and tells Ash and Brock to move along.
Ash asks Brock if he can tell him anything about the Cerulean City Gym Leader. Brock says that since he is also a Gym Leader, he can't tell. Brock says that he has something that he needs to do and Ash heads to the Gym by himself.
When Ash arrives at the Gym, he sees three sisters performing a show. Ash confronts them backstage and discovers that they are the Gym Leaders and he challenges them to a gym battle. The girls (Lily, Daisy, and Violet) tell Ash that they can't because their Pokémon have battle three other trainers from a place called Pallet Town and their Pokémon are all worn out. The only Pokémon they have left is a Goldeen that only knows Horn Attack. They offer Ash a badge without battling when Misty appears saying that she, the fourth Cerulean Sister, will battle him.
It turns out that Misty is the youngest Cerulean Sister and the other three call her a runt. After Misty fights with her sisters, Misty challenges Ash to an official 2 on 2 gym battle. Ash accepts.
At the start of the battle, Ash tried to send out Pikachu, but Pikachu didn't want to battle Misty. Ash then sends out Butterfree instead. While Misty sends out Staryu. Even though both sides are even, Staryu quickly knocked Butterfree into the water, making it lose. Misty withdraws Staryu and sends out her Starmie and Ash withdraws Butterfree and sends out his Pidgeotto. Pidgeotto uses Whirlwind on Starmie, but it jumps into the water and Tackles Pidgeotto. Pidgeotto use Wing Attack, but got hit by Starmie's Tackle again. Pidgeotto uses Gust on it, making Starmie hit the wall.
Just as Ash is about to win, Team Rocket bursts in with the stolen vacuum and tries to steal all the water Pokémon with it. Their plan is to steal the water from the pool. It sucks in all the Pokémon including Seel and Pikachu but Ash tells Pikachu to use Thunderbolt due to water conducting electricity. The attack causes the machine to malfunction and Team Rocket to get electrocuted and fall into the water. They are then sucked down into the vacuum and, to the delight of Seel, blasted out from the other side and fly off into the sky.
After Team Rocket goes flying, Daisy gives Ash the Cascade Badge. Misty protests this until Daisy points out that if Ash used Pikachu from the start he would have won. Ash gladly accepts the badge. Ash and Misty leave the gym while arguing and Brock meets them and they all head out to Vermilion City.
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