The episodes begins with Ash and his friends continuing their journey to Nimbasa City. On their way, they spot a beautiful lake. Iris and Cilan think it is a great place to stop for lunch, but all Ash is thinking about is what Trip said to him in the previous episode, when he said that Oshawott was having trouble with Aqua Jet because he wasn't opening his eyes underwater, and Ash decides that this is the perfect training spot for that. So the group lets out all of their Pokémon, excluding Iris's Excadrill. Ash and Oshawott go into the water while the others start cooking.
Ash and Oshawott jump in the water and begin training. Ash tries to get Oshawott to open his eyes underwater, but he refuses. So Ash forcibly opens Oshawott's eyes. This scares Oshawott so much that he uses Water Gun on Ash, blasting him out of the lake. Ash, frustrated, decides to go back to the group with Oshawott.
Back at the camp, Cilan is cooking lunch while Iris watches. All of the Pokémon are having fun playing together, except for Snivy and Emolga, as they keep getting into fights. The group starts playing catch, but Emolga forcibly hits the ball as hard as she can at Snivy, so Snivy uses Vine Whip to send it away. Cilan's Dwebble catches it, but the ball deflates after Dwebble touches it with its pointy hands. Meanwhile, Ash's Scraggy wanders off and finds a group of Foongus. He begins to Headbutt them like he does with every other Pokémon he meets. Cilan announces that lunch is ready, but the other Pokémon have gone to see what happened. Enraged, the Foongus attacks Scraggy with poison spores to paralyze them, including other Pokémon who arrive to see what happend. Iris and Cilan go to see what happened, and they are devastated. Ash and Oshawott soon come up, equally concerned. Ash then scans the Foongus with his Pokédex and the Foongus run away. Cilan states the Pokémon need serious medical attention, but there are no Pokémon Centers for miles.
However, Iris comes up with an idea. She says she needs a Remeyo weed found at the bottom of the lake in order to cure the Pokémon. Iris volunteers to watch the Pokémon, while Ash, Oshawott, and Cilan go back to the lake. Ash and Oshawott go to the bottom of the lake. However, Oshawott still won't open his eyes and Ash has to guide him by pulling on his ears. Meanwhile, back at camp, the condition of the Pokémon is becoming worse. Nearby, an angry Palpitoad watches the duo and decides to attack. So it commands a group of Tympole to attack them. Ash spots the Remeyo weed and tells Oshawott to grab it, but before Oshawott could grab it, an group of Tympole attacks him. Ash manages to get away, but Oshawott, with his eyes closed, is a sitting duck just waiting to be attacked. Ash tries to get Oshawott out of harms way, but the Tympole attack with powerful Hydro Pump and Supersonic attacks. Oshawott tries to fight back using Razor Shell, but cannot hit them due to his eyes being closed through under water. Ash begs Oshawott to open his eyes, and after a few tries, he succeeds and reflects a BubbleBeam shot at him by the Tympole. The Tympole then swim away in fear. Ash and Oshawott decide to retreat for now. However, the angry Palpitoad isn't done with them yet. It calls on its friend, Stunfisk, who was hiding with Camouflage, to attack Ash and Oshawott. So Stunfisk launches a powerful ThunderShock attack. Ash and Oshawott we're somehow able get out of the lake unharmed. Ash and Cilan then ponder their next move.
Ash and Oshawott plan to swim down the bottom of the lake again. However, Stunfisk jumps out of the lake and begins to fight with. Cilan volunteers to distract Stunfisk using his expert fishing skills. Cilan then starts throwing Stunfisk in the air and spinning it around, hoping to make it knock out, and tells Ash and Oshawott to hurry and get the Remeyo weed. However, the Palpitoad jumps out of the lake and attacks them. Stunfisk uses Mud Bomb on Cilan, which he barely dodges. Ash decided to use Oshawott to battle against Palpitoad. Oshawott is little nervous about that, but Ash convinces him. Oshawott starts with a Water Gun, but is easily countered by Palpitoad's Hydro Pump. Ash commands Oshawott to use Razor Shell, but is stopped by Palpitoad's Supersonic. Palpitoad then quickly switches to Mud Shot, making contact, and blasts Oshawott into a small pool of mud. Cilan takes note of how quickly Palpitoad can alternate between moves. Oshawott stands up, wipes the mud off his face, and continues to battle.
Oshawott and Palpitoad continue battling. Ash commands an Aqua Jet, but misses due to his eyes closed. Palpitoad then aims another Mud Shot at Oshawott. Ash tells Oshawott to remember how he beat the Tympole because he had his eyes open, and that convinces him to open them now and is able to dodge the Mud Shot attack and hits Palpitoad with the powerful Aqua Jet, knocking it out. Meanwhile, Cilan was able to knock out the Stunfisk from getting dizzy. The two Trainers decide to capture the Pokémon, Ash getting Palpitoad and Cilan getting Stunfisk. Afterwards, Oshawott easily goes down to the bottom of the lake and grabs the Remeyo weed. The trio go back to camp and Iris crushes it into medicine that the Pokémon take.
Afterwards, the Pokémon are recovered from poisons. The group of Pokémon cheer for Oshawott for being brave and mastering Aqua Jet.
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