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The film comes accompanied by a short mini-movie featuring Pikachu. In this mini-movie, Pikachu and his friends are left on a skyscraper in Big City by their trainers, who go off to prepare an unknown surprise for the Pokémon. Pikachu meets the Pichu Brothers, saving the younger one from falling off an opposite building. A group of Murkrow chase Pikachu off a flagpole, and he uses a group of Hoppip to reach the other side, sending Meowth who is window-cleaning, flying into a billboard. The Pichu Bros. assist Pikachu to return to his friends but they end up going on a journey across the city to the Pichu Bros' playground. On the way, they get chased by a Houndour who they later encounter again. The angry Houndour chases the three around until he nearly knocks the playground over. Pikachu, the Pichu Bros., Houndour and their assortment of friends manage to save the playground. Pikachu realizes it is nearly six o'clock and he must return to his friends before Ash, his trainer, does. Pikachu and the Pichu Bros. use a tire to get to the building, sending Meowth flying again. The three arrive in the nick of time, the Pichu Brothers departing. Ash, Misty and Brock arrive and take the Pokémon into a room where a party has been laid out for them in celebration of the first anniversary of Ash and Pikachu's meeting.