On the day before Christmas, Pikachu and its Pokémon friends are playing in a snowy town. But their snowball bowling game goes awry, and Totodile's snowball knocks a passing Delibird out of the sky! Delibird crashes down onto Meowth and Wobbuffet, who were out for an innocent stroll, but a wild Skarmory is annoyed at the racket and sends them all blasting off. Delibird has another bumpy landing, and now it's in a panic because it's lost all the presents that were in its sack. If they're not found by midnight, they won't be delivered for Christmas! Fortunately, Pikachu and its friends will help Delibird find all the presents.
Everyone splits up into two groups. Pikachu's group finds one present on top of a boat, while Bulbasaur's group spots another present in the forest. A third present is retrieved from the clutches of a wild Aipom. Just before midnight, the two groups meet up in town and discover the last missing present in a tree. When they try to grab it, it goes flying into the air and the wild Aipom comes to the rescue with a last-minute catch! Now the presents are in place and the holiday is saved, thanks to Pikachu and its friends.
It is the day before Christmas. The Pokémon are bowling with snowballs, Pikachu gets a strike. Bulbasaur and Chikorita reset the bottles for Cyndaquil, who misses the mark. Totodile then moves forward with a giant snowball in its mouth. It trips, and the snowball is sent up into the air with a Water Gun, hitting a passing Delibird. As Delibird plummets towards the ground the Pokémon rush over.
Meanwhile, Meowth is telling Wobbuffet about his nasty run-in with a Skarmory. The pair scale some stairs and come across a Skarmory sleeping on the handrail. Meowth warns Wobbuffet not to get Skarmory angry when Delibird and the snowball come crashing down. Skarmory uses a Wing Attack, causing Meowth and Wobbuffet to blast off, while Delibird falls into the woods, its presents scattering everywhere. Noctowl tries to hold Delibird up, but it is too heavy. Luckily Bulbasaur and Chikorita use their vines together to pull Delibird safely to the ground.
Cyndaquil tickles Delibird to wake it up, and Togepi and Pikachu befriend it. Delibird realizes that the presents are gone, but the Pokémon quickly promise to help find them. They split up into two groups and start looking. Pikachu notices the first present on a boat that is moving along the river, and Totodile chases after it. After Totodile picks up the present, Chikorita pulls it over to land. Meanwhile in the woods, Noctowl has searched from the air but returns with no presents. Psyduck becomes side-tracked and joins a passing group of Gloom. Bulbasaur stops their parade and asks the Gloom if they have seen any of the presents. They have, and so Noctowl scans the area. Spotting a present in a tree, all that they need to do now is get it down. Geodude solves this by banging into the tree.
While searching an alleyway, Cyndaquil falls asleep out of exhaustion. Pikachu gently wakes it up, though Cyndaquil still falls onto its back from the unexpected scare. As Cyndaquil stops squirming, Pikachu looks up and sees the third present is on a clothesline overhead. As they prepare to retrieve it, an Aipom spots the present and refuses to hand it over. The Pokémon throw snowballs at it, but to no avail. The Aipom is dancing around mischievously by this time, but is then hit by a snowball it doesn't see and ends up falling. Pikachu breaks its fall, and the Aipom runs off without the present.
Later, the two search groups meet up, with Bulbasaur handing two gifts over to Delibird. However they still need to find another one and there is only ten minutes till midnight. As night sets, Noctowl spots the present in another tree. With a bit of effort, Noctowl pulls it out, but it starts falling down the tree. Due to the angle of the branches, it flies past them. Though they run after it, they can't catch up, especially as Bulbasaur and Chikorita are flicking it up to stop it hitting the ground. Totodile finally catches it, but then everyone runs into it and the present goes flying over a cliff. The same Aipom from earlier happens to be there, and it grabs the present in its tail.
Aipom gives the present to Pikachu, who in turn hands it to Delibird. And just in time as the clock has struck midnight and the Christmas Tree beside them lights up. A booming voice, none other than Santa Claus himself, thanks the Pokémon for their help. Delibird hops into the sleigh with Santa. Stantler lets out a cry before pulling the sleigh into the night sky as Santa and his crew set off to deliver presents across the world.