The episode starts with Ash and co. having lunch on the Muraille Coast, with all of their Pokemon.
Serena shows a fishing rod to the rest of the group.
They all decided to go fishing.
Ash sits on a rock with Pikachu and Froakie and he has caught something on his fishing line.
He pulls it out and it is a Skrelp, covered in seaweed, Skrelp then attaches itself to Ash's face.
Ash pulls Skrelp off and Bonnie puts a bandaid on its head.
Skrelp jumps back into the water, before Ash checks it on his Pokedex.
The Skrelp then begins attacking.
Pikachu tries to calm the Skrelp, but Pikachu ends up getting hit with a Poison attack.
Pikachu has become poisoned, so Ash asks two people who are in a van on a nearby road for help.
Ash and co., including the two other people go to where Ash and his friends had lunch.
The two people, who are marine biologists, heal Pikachu back to health.
The man is called Eddie and the woman is called Lindsay.
The marine biologists tell Ash and co. about a sunken luxury liner, which they are trying to find.
Team Rocket overhear this and all they think about is stealing treasure from the ship.
Ash and co. go with the marine biologists on their boat/ship to go and find the ship.
While on the ship, Clemont reveals another invention of his.
The machine chooses who gets to go on the underwater exploration.
It's Ash and Serena vs. Clemont and Bonnie.
Ash and Serena win, leaving Clemont embarrassed and Bonnie annoyed.
Ash and Serena go with Lindsay underwater, in Lindsay and Eddie's submarine.
Clemont, Bonnie and Eddie stay in communication with the other group, I think.
Ash and Serena are excited to see the different kinds of Pokemon underwater.
Ash's group end up finding the sunken ship.
Ash ends up spotting a Dragalage and he checks it on his Pokedex.
He finds out that it is the evolved form of Skrelp.
Dare Da? Skrelp.
Team Rocket are in their Magikarp submarine and use some invention to cut a hole in the sunken ship.
Ash sees the Magikarp sumbarine.
He remembers the golden Magikarp submarine that Team Rocket used two episode ago.
He figures that it must be Team Rocket.
Team Rocket enter the ship and they start walking through a hallway.
Ash's group then end up inside the ship as well and come across a group of Skrelp and Dragalge.
Ash's group comes across Team Rocket.
Team Rocket puts an explosive device on the ship, I think.
Ash sends out Froakie to battle Team Rocket.
Team Rocket leave and then so do Ash and co.
The sunken ship starts to fall.
The underwater Pokemon and Froakie decide to help push the ship back to where it was.
Froakie is captured by a robotic arm that comes from Team Rocket's submarine.
The arm throws it at the Skrelp which Ash encountered earlier.
The rest of the underwater Pokemon successfully put the ship back to where it used to be underwater.
A board is put over a hole in the ship.
Some Dragalge attach the board to the ship with a Poison attack.
Team Rocket's submarine is now at the ocean's surface and then they blast off.
Ash's Froakie and the Skrelp from earlier are stuck in a whirlpool.
Froakie decided to be brave and jump along the debris in the whirlpool, to safety.
As the sun set's, Ash's group are back on the boat where Clemont's group was.
Ash and co. say goodbye to Skrelp and I think Bonnie said something about Froakie.
To be continued.
The Castle on the Seabed! Skrelp & Dragalge!!
