As the sunlight shines above, and leaves float by, Pikachu, Pachirisu, Buneary, Monferno, Happiny, Buizel, Sudowoodo, Grotle, Croagunk, Mamoswine, and Piplup are sliding down the hill on large leaves, while Staraptor and Gliscor are following them in the air. As the Pokémon are sliding down the hill, Mamoswine bumps into them to send them flying. Mamoswine slides down safely as the other Pokémon land on it and then hit the ground. The Pokémon are happy and had a lot of fun sliding down the hill.
Buizel and Monferno go back and forth on a teeter-totter, while Pachirisu, Happiny, and Buneary get on the other one. Mamoswine steps on the teeter-totter and sends them flying into the air, but Staraptor catches them before so they don't get hurt. Croagunk stands near a fountain and looks at its reflection in the water. Gliscor and Sudowoodo are swinging on the swing set. Pikachu and Piplup chase after a ball. As Grotle looks on, they chase the ball and fall down the hill. Pikachu lands on top of the ball and spins it all the way into the water. Once in the water, Pikachu continues to roll the ball down the river. A Wooper knocks the ball out of the water with its head, and Piplup grabs Pikachu once he lands in the water. A group of Wooper and Quagsire play with the ball as Pikachu and Piplup continue to go down the river. They go down a small waterfall and see that a passing boat shaped like a Lapras runs over the ball and sends it flying. The ball lands on the street and bounces towards a building while avoiding cars and trucks.
Piplup and Pikachu wonder where they are as they walk down an alleyway while searching for the ball. They see a very tall building, decide to climb it, and check to see if they can spot the ball from the roof. They spot the ball rolling down another building's roof, jump on to a billboard, and on top of a Pichu and Smoochum. Yellow, red, purple, green, and pink jewels with the bracelet they were attached to hit a railing and go flying into the air and land in separate areas. Pikachu and Piplup check to see if the other two Pokémon are okay as Mime Jr. looks on. Pichu realizes that the jewels are missing and only finds the holder piece which is on the ground. Pichu and Smoochum are very upset about it and Pikachu and Piplup apologize. Pichu shows the Pokémon the room on the roof which holds a lot of fruit and a cake for Bellossom's birthday. Smoochum gives Pikachu and Piplup an invitation to the party.
Bellossom is trying to decide between a pink outfit and a purple outfit to wear to the party. Piplup and Pikachu tell Smoochum that they will help them find the missing jewels. They look at the clock tower and realize they don't have much time to locate the missing jewels.
Mime Jr. goes to tell Meowth all about the missing jewels and what the Pokémon want to do with them. Meowth decides that they will get to those jewels first and scurries to find them. Meowth locks the gate to the roof so that the other Pokémon cannot use that way to come down from the roof. Piplup tries to open it, but it won't budge. Meowth and his friends run as fast as they can to find the jewels as they jump on and off a Snorlax on the way. Meowth finds the red jewel, but has trouble reaching it. He has Wobbuffet get down so he can climb up to grab the jewel. Meowth tries a few times and finally touches the jewel, but a Marill they recognize shows up. Marill uses Sing to put them to sleep. When they fall asleep, the red jewel falls out of Meowth's hand and rolls away. After Marill stops singing, it is mad and hits them with its tail.
When going through the alleyway, the other Pokémon jump on and off Snorlax to get through. Piplup and Smoochum trip and fall down while Smoochum blames Piplup for that happening. Piplup apologizes, and Pikachu shows that he found the red jewel. Smoochum places it back on the necklace. They run past Meowth and his friends as they finally wake up. Meowth notices that the red jewel that was in his hand is no longer with him. They run down some steps by a river, and see the pink jewel by tires and the water. A Feraligatr comes out of the water while the other Pokémon beg it not to take the jewel. The Feraligatr sits right on top of the tires and right behind the jewel and falls asleep. Meowth is scared but goes up to the Feraligatr to ask it if they can have the jewel. The Feraligatr uses Hydro Pump to send them into the wall. Meowth decides to use bananas as a decoy to lure Feraligatr away from the pink jewel. Feraligatr thinks it may be Meowth so it pretends to not go after the fruit while Meowth pokes his head up. Feraligatr pulls on the fruit to bring the other Pokémon to it. Feraligatr sends them blasting off with Aqua Tail.
Pikachu and the other Pokémon walk down the steps and notice the pink jewel. Piplup starts to walk up to the Feraligatr. Pichu tells him not to because it's too dangerous, but Piplup says he can handle it. He walks up to Feraligatr, and asks it if they can have the jewel. Feraligatr loudly says its name which sends Piplup spinning and into the wall. The other Pokémon have a disgusted look on their faces after the failure. Piplup spins to use Whirlpool towards Feraligatr, but Feraligatr uses Hydro Pump to send him back into the wall. Feraligatr jumps back into the water, which allows the other Pokémon to go after the pink jewel. Pikachu picks up the pink jewel. The Pokémon find a bottle cap with a red star on it down an alleyway and Piplup picks it up. Smoochum explains that it is not what they are looking for, and Piplup looks embarrassed about it.
Meanwhile, Meowth and his friends are walking by a lake and Mime Jr. picks up a large diamond ring piece. Meowth throws it in the lake because he doesn't think it's what they are after. He suddenly realizes how valuable it is and knows that he made a mistake throwing it into the water. Walking down the park pathway, Pikachu and the others notice the yellow jewel on top of the roof of a building. They climb on to the roof but Meowth grabs it. They yell at Meowth to give it back because it is very important. A Murkrow flies down, grabs the jewel and flies away. The Pokémon yell for it to come back, but it's no good. Pichu whistles to call for help from some Drifloon. The Pokémon grab on to the Drifloon and go after the Murkrow. Mime Jr. uses Teeter Dance which causes Piplup to pull the Drifloon into a billboard, and Pikachu, Pichu, and Smoochum pull their Drifloon off course. Meowth and his friends make it to the Murkrow who is at the very point at the top of a tall building. The Drifloon float away after they land on the roof. Meowth uses Scratch which misses Murkrow, but the jewel drops out of its beak as Murkrow flies away. Meowth picks up the yellow jewel to celebrate as the singing Marill floats up with balloons to approach them. Marill uses Sing to put them to sleep. As they fall asleep, the yellow jewel falls out of Meowth's hand and floats to the in the air. After Marill finishes singing, it slaps the Pokémon with its tail.
Pikachu and his friends are floating back on course as the yellow jewel floats towards them. They aren't able to grab it as it floats by and Piplup jumps to grab it, but falls and bounces on Snorlax's stomach and goes right back up to Drifloon who catches him. Pikachu is able to grab the jewel. As they are floating, they see an airplane that is yellow with Celebi, Plusle, Minun, Deoxys, Torchic, Munchlax, Jirachi, Latios, Latias, and Pikachu pictured on it. The Pokémon wave as the plane passes them by. The clock tower rings, and the Pokémon realize that they are running out of time. Pikachu spots the purple jewel, and they run to go grab it. Meowth and his friends also were going after it, but the wind blows it away and it lands in the back of a pickup truck. The Pokémon see skateboards and ride them down the street bumping into each other, trying to catch the truck. After they first bumped each other, Pikachu and his friends rode up the side of the bridge on the skateboard. The second time they bumped each other, Pikachu and his friends went down a different street, while Meowth and the other Pokémon went down the street that the truck used. They catch up to the truck, but the Marill appears and uses Sing to put them to sleep. After Marill is done singing, it inflates and slaps them with its tail and sends them flying. They run into a fire hydrant, and the water shoots out of it making the purple jewel comes out of Meowth's hand and flies into the sky and ends up elsewhere. Meowth and the others are still sleeping on the water of the hydrant, while a bunch of Wooper dance around with a rainbow surrounding them.
As Pikachu and his friends are still riding a skateboard down the street, the purple jewel falls and lands on Piplup's head, sending him tumbling backwards. Piplup is very excited that he found the jewel. Pichu attaches the final jewel to the necklace, and they run under a fence and bump into the Bellossom who is having their birthday. Bellossom was wearing the pink outfit that she chose. Bellossom shows to them that she found the final jewel which was the green jewel. The ball that they were searching for before rolls by and Pikachu picks it up. The Pokémon go to the party, along with the Drifloon from before. Bellossom blows out its birthday candle on the birthday cake. Pichu places the birthday pendant on Bellossom, and she thanks everyone for the wonderful birthday party.
Pikachu and the others float on Drifloon to be back with their friends that are waiting for them on top of the hill. All of them watch the fireworks from on top of the hill. Pichu, Smoochum, and Bellossom also watch the fireworks from the roof of the building where the party was. Meowth, Mime Jr. and Wobbuffet watch the fireworks on top of tires in an alleyway. The Marill from before walks right behind them. The episode finishes as Pikachu and Piplup watch the fireworks together.