Meloetta and the Undersea Temple! (Japanese: メロエッタと海底の神殿！ Meloetta and the Underwater Temple!) is the 48th episode of Pokémon: BW Rival Destinies.
Something big is going on in Unova and it involves Team Rocket. They'll make their plan to capture Meloetta for an evil plot to take over Unova and the whole worldwide region. Meanwhile, in Cynthia's vacation home in Undella Town, Ash and co. meet a man named Ridley who's with Golurk (in a misunderstanding way of calling them villains). Now that Ash and his friends know the story of what happened with Ridley and Meloetta, and learned the truth, Meloetta's location is compromised as Team Rocket breach the perimeter of the vacation home. During their escape from Cynthia's vacation home as Ridley and Golurk hold them off while they escape with Meloetta, Ash (finally) comes face to face with Giovanni, the leader of Team Rocket and bears witness to Meloetta's true power and captured it (when they used their anti-stealth goggles to see it) while Ash and Pikachu are being held hostage. Can Ash's friends be able to save them in time?
At a platform in the middle of the sea, Team Rocket meet up with Giovanni, who has landed. Giovanni is pleased, for Team Rocket will control Unova and orders the launch of Operation Tempest. Meanwhile, Ash trains with Cilan, as his Oshawott blocks Pansage's Bullet Seed. Meloetta praises Oshawott, approaches him and sings a song. A man flies with Golurk and recognizes her voice. The song causes Meloetta to change form and points at Oshawott. Cilan believes she wants to battle Oshawott. Ash accepts this and orders Aqua Jet, but Oshawott does not want to attack Meloetta, having a crush on her. Ash calls Oshawott back and sends Krookodile instead. Meloetta uses Hyper Voice, affecting Krookodile, who uses Stone Edge, but is countered by Meloetta's Close Combat.
Jervis gets a call from Cynthia, who informs him she will be coming home. Jervis reports Meloetta is helping with the heroes' special training. Cythia is glad to hear that and promises to be back before dawn. Krookodile uses Dragon Claw, but is stopped by a flashing light, as a Golurk appears in the middle of the field. A man appears, whom Meloetta recognizes and is thrilled by his appearance. The man accuses Ash to have stolen Meloetta and orders Golurk to use Flash Cannon. Meloetta rushes to Ash, who explains he is not his enemy. However, a camera spies all of them. The man apologises for the trouble and introduces himself as Ridley, who senses Meloetta likes Ash. Ash asks why did Ridley call him a villain, so Ridley explains one day when Meloetta was playing in the field, she was captured by some people. He tried to get her back, but Yamask came and used Haze.
Until now, he has been searching for Meloetta. Iris thinks Meloetta belongs to Ridley, who explains nobody owns Meloetta. In fact, they are protecting her from these villains. Meloetta sees a camera and Ridley realizes the villains know Meloetta is here. Ridley leaves, for his friends found a new place where they can protect Meloetta. He exits the house, but is soon covered by Haze. Ridley goes to leave on Golurk, but Golurk is hit by a Golem. A Power Gem is launched, so Golurk uses Flash Cannon to intercept. The heroes notice a Rhydon as well and two people, who are members of Team Rocket. Rhydon uses Megahorn, which is countered by Golurk's Strength, while Golem uses Rock Blast. The heroes leave with Meloetta, while Golurk uses Heavy Slam, hitting Rhydon. Golem uses Steamroller, which Golurk endures.
The heroes run and Meloetta becomes invisible. Suddenly, Will O' Wisp surrounds the heroes, as they encounter Jessie, James, Meowth, Yamask, and Woobat. Team Rocket sees Meloetta with their gear on and Yamask uses Will O' Wisp, hitting Meloetta. The heroes demand to know why are Team Rocket after Meloetta, but Team Rocket refuses to speak about it. However, they thank the twerps, for they managed to make Meloetta sing her song. Pikachu uses Thunderbolt, but misses and gets hit by Woobat's Air Slash, with Yamask using Haze. Axew uses Dragon Rage, but misses, while Cilan sends Pansage, who uses Bullet Seed. Ash leaves with Meloetta, while Iris and Cilan fight Jessie and James. Suddenly, Ash is ambushed by a Persian. Meloetta turns invisible, while Ash faces Persian and its owner, Giovanni.
Persian uses Shadow Claw, but is hit by Pikachu's Iron Tail. Persian uses Power Gem, hitting Pikachu, knocking Ash and Pikachu down. Meloetta appears and rushes to Ash and Pikachu, who are being captured in a cage. Giovanni forces Meloetta to do his bidding, as the cage with Ash and Pikachu begins to shrink. Meloetta yells, stopping the shrinking, which pleases Giovanni, who calls Persian back. Iris and Cilan come and witness Ash, Meloetta and Pikachu being taken into the aircraft. Team Rocket enters the aircraft as well, replying the twerps got delayed instead. Iris and Cilan see the aircraft flying away and notice Ridley is here. As Team Rocket dives with their submarine, Ash tells Meloetta everything will be okay. They arrive at the depth of the sea, at a temple. Dr. Zager explains the temple disappeared long time ago into the sea and couldn't be found until now.
They enter the temple's inner chamber and everyone emerges. Meloetta is terrified of the place, but Giovanni is convinced Meloetta knows what this place is. Meloetta is placed near a statue, while Giovanni promises should she resist, Ash and Pikachu would pay the price. Meloetta is placed into the statue, while Team Rocket explain for this ceremony Meloetta would have to sing herself, but they recorded the song. They play her song, which opens the center of the chamber. Outside, Ridley hears Meloetta's song. Giovanni thanks Meloetta, for this song unlocks a special seal of the temple. Giovanni comes to the center, which raises the Reveal Glass, while Meloetta begins to be consumed by the power.
Meanwhile, Iris, Cilan, and Ridley report to Cynthia, who came back. Cynthia orders Jervis to prepare the ship, while Ridley needs to point the path where Meloetta, Ash and Pikachu are. Cynthia asks Ridley what is the power which Team Rocket desires from Meloetta. Giovanni unleashes the power, rising the underwater temple back to surface, as the Project Tempest starts.
- Ash finally confronts Giovanni after more than 14 years and 15 seasons.
- Who's that Pokémon?: Golurk (US).