Ash and his friends arrive at a Pokémon only park. They set all their Pokémon loose and, after Ash tells Pikachu to watch over Togepi, they enter for a day of fun and relaxation. Unfortunately, it's not going to turn out the way they had hoped.

Moments after they enter, Togepi starts to cry of hunger. Pikachu and Squirtle both try to cheer him up by making faces, but he cries on. Squirtle notices an apple in a tree, and Bulbasaur gets it down with Razor Leaf. The apple bounces to the ground and rolls to Psyduck's feet. Unknowing of Togepi's hunger, he eats it and walks off. Togepi continues to bawl. Bulbasaur sends out his Vines and lift him into the air. He gently waves Togepi in the air while quietly singing the first use of Bulbabye. Togepi calms down and goes to sleep.

A little bit later, four Pokémon come walking down the path. Snubble, Marril, Cubone, and Raichu are all talking rather loudly and Togepi looks as if he may wake up. Pikachu, Squirtle, and Bulbasaur confront the group and ask them to be quiet. They are less then willing to comply, and both groups get ticked off at each other. Pikachu tries to get them to set a good example for Togepi, but they don't listen. Suddenly, Pikachu realizes that Togepi has awakened and is now walking on a log crossing a rushing river. He goes after him, only to have the log start rolling with both him and Togepi on it.

After a moment of rolling, Pikachu falls off into the water. He watches as the log goes off a cliff and into a large lake below, sending several water Pokémon into the air. He looks up at the edge of the cliff and is relieved to see that Togepi is safe and sound.

Back at the original scene, Squirtle and Snubble have puffed out their chests. Squirtle topples over onto his shell and the other Pokémon laugh. At this, Squirtle gets even more ticked off and challenges Marril, a water type Pokémon, to a race. Soon afterwards, they are both standing at the edge of the lake, the other side as the finish line. Pikachu waves his hand to start the race, and an Electrode uses Explosion, knocking over all the Pokémon nearby. Squirtle and Marril are fairly evenly matched until Marril takes a deep breath and dives under the water, pulling ahead. As he can't see where he's going, he slams into a Starmie, who Water Guns him to one side of the lake.

Squirtle continues to swim along, confident that he'll win. Suddenly, it occurs to him that he's going backwards and he realizes that he's on the back of a Goldeen, who's rapidly taking him back towards the starting line. He jumps off and tries his hardest to get to the other side, but he's too late and Marril wins.

The two groups of Pokémon confront each other once again, and Raichu starts sending sparks out. Togepi is frightened and Pikachu protects him, only to be shocked himself. At this, Pikachu gets angry and he walks up to Raichu. Pressing their cheeks together, they start to run quite fast up a mountain, down the mountain, up a waterfall, through a field (where they blast Team Rocket's Pokémon into the air), along another path (where they blast a Hitmonchan and Hitmonlee into the air), and over Charizard's tail. Charizard gets angry and chases after them, getting in head and using his wings to Gust them away. They land onto a Snorlax's stomach and bounce off, only to have the Snorlax roll on top of him.

After squeezing out from under Snorlax's huge body, Pikachu, Raichu, and the rest of the Pokémon face off once again. Charizard, who had been flying about, swoops down over them and frightening them. He doesn't watch where he goes though, and crashes through a jungle gym type thing and a couple of piles of tires, ultimately getting his head wedged into a small pipe. He thrashes about for a bit, yelling out. Meowth, who is resting with Arbok and Weezing directly above, gets annoyed and leans over the ledge to yell down. At this moment, Charizard lets out a burst of flames, scorching Meowth's face.

Pikachu, Bulbasaur, Squirtle, Togepi, Psyduck, Geodude, Pidgeotto, Zubat, Vulpix, and Onix all join in together pulling on a rope tied to Charizard's leg while he continues to let blast after blast of fire through the pipe. They pull and pull, but can't get him free. Snubble, Marril, Raichu, and Cubone stand nearby, laughing. Charizard shifts his leg, and all the Pokémon fly forward. Charizard gets worried that he may never get out, and starts to sob. Pikachu walks over to where the other Pokémon are standing and asks them to help. Snubble, Marril, and Raichu agree to help, but Cubone, caring only for himself, refuses.

All the Pokémon, with their new helpers, continue to pull at Charizard's leg as Cubone looks on. Soon, seeing how upset Charizard is and how the others almost have him out but not quite, he joins in at the head of the team. After another few moments of pulling, Charizard's head pops out, and they all fly backward. Charizard, happy to be free, flies up into the air with Psyduck still holding onto the rope. Meowth, having been woken up once again, lights a bomb to throw down at the Pokémon below. Seeing a shadow, he looks up just in time to see Charizard land on him. Psyduck bounces off of Charizard's stomach and the bomb explodes beneath the large Pokémon. He moves, and Meowth emerges from the hole long enough to say that he'll sleep right there, slipping back down again. All of the Pokémon, relieved to have Charizard out, work together to help rebuild the things he broke. Afterwards, they play in the sand, water, and on swings and slides together, showing how much can be done and how much fun Pokémon (and people for that matter) can have when they set aside their differences.

Later that afternoon, all the Pokémon sit and watch the sunset. They hear Ash, Misty, and Brock calling for them and set off. Pikachu lags behind long enough to thank their new friends, then dashes forward into Ash's arms. "Did you have fun?" he asks. Pikachu just smiles and says "Pika!"

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The movie opens with a shot of a busy road, and a big building. Ash and the gang (Misty and Brock w/ Pikachu, Togepi, and their Pokémon) are going up an elevator, in the big building. Pikachu sees a Pichu, which makes a funny face at him. Pikachu makes one back, but its gone by then. They get to the top, and they let out their Pokémon to play. Ash tells the Pokémon that he will be back at 6:00, and now its 10:00.

After that's over, all of the Pokémon are playing around, when Pikachu sees the Pichu again, which makes a face, and slaps his own butt. Another Pichu comes out, which is the others Brother. Both Pikachu and the Pichu are on separate buildings, about 20 ft from each other. One of the Pichu almost falls, so Pikachu decides to take action, and starts to run down a little bit, grabs onto a pole, and gets ready to save Pichu, just to find out that Pichu was just helped up by his brother. Pikachu looks down, and he realizes that he is on a pole, about 30 stories up from the street.

Some Yamikarasu start to come over and bug Pikachu, pecking him, because he is on their territory. Pikachu grabs onto a clothesline that connects the two buildings, but the Yamikarasu start to peck at him, and he almost starts to fall off. On the building across from Pikachu is Meowth, working a Part Time job as a window washer. He looks over, and sees Pikachu, but guesses that he is just dreaming. Right before the Yamikarasu almost peck Pikachu down, the wind starts up, and about 40 Hannekko come, and float in the air. Pikachu starts to jump from one to the other, and then uses the small platform that Meowth is on as a springboard, springing Meowth very, very far away.

He's now is on the other building, with the Pichu. He yells out to the other Pokémon, but is drowned out by the traffic. The Pichu motion for him to come with them, so he runs along with them. They go through a small grate, and find themselves on top of an elevator, going down. When it stops, they go into the Air Conditioning vent, and drop about 30 feet, before rolling onto the top of a truck, where the AC vent ends. They use the truck to transport themselves, riding on the top, but at a sharp turn, they get thrown off, because they can't balance anymore. They find themselves in a small body of water, going through the city. They cling to a wooden rafter, which lets them float. Suddenly, they see something that looks like a giant Lapras, but it is a large cruse boat, heading straight for them. Pikachu starts to push the rafter as fast as he can, swimming. When they are about to hit the boat, a Gyarados comes from nowhere, and makes them skyrocket up, landing on a Derubiru, which causes him to start chasing them. They climb up a pole, and go over a fence, but the Derubiru climbs over. The end of the pole comes, but when they go down, they get to a fence. Cornered, the two Pichu decide to use Thundershock, which completely tires them out, and barely effects the Derubiru. Pikachu has nothing to do, except to try to climb over the fence with the two asleep Pichu, which he eventually does. He jumps on another fence, and jump down, hoping for a miracle to happen, because there is an even higher fence right next to them, which they cannot climb over. They jump down, but they hit a Snorlax, which they easily bounce off of, and go to the next fence. The Derubiru tries to copy them, but when he jumps down, nothing is there, because the Snorlax decided to roll over. He rolls back to where he used to be, on top of the Derubiru.

Once the Pichu wake up, Pikachu and the Pichu find themselves in a tire yard, where many tires are made into a play fort, held down by many ropes. Many Pokémon jump out, and do a little dance scene. After that, the Pokémon leave, but then, Pikachu hears the clock chime 5:00. Right as that happens, he also sees the Derubiru, which results in another chase around the Tire fort. Suddenly, some of the tires start to come loose, and land on the Derubiru. Pikachu and the two Pichu save the Derubiru, but as that happens, even more tires become loose, and the whole structure almost comes apart, but then, while Derubiru holds one part of the structure, Pikachu goes to hold together one of the ropes that holds the Fort together, which starts to rip. The Pichu call out to the other Pokémon, which start to come, and help Pikachu and Derubiru. They start to try to repair the building, but the rope that Pikachu and the other Pokémon are trying to hold together snaps. Right before the whole thing almost falls, the Derubiru jams another tire in between one of the broken links, and holds it together for a few more minutes. The Pokémon all start to pile up the tires, trying to stabilize the building, and finally fix it.