Ash and his friends and Pokémon, on the way of their journey, come to a grassland, where the fresh air is felt. Then they fall asleep, feeling good. But after a while, Togepi wakes, noting Rediba, ladybug-like Pokémon, fly in the sky. He enjoys seeing them passing by, and staggers backward and rolls down the steep of the hill they were on.
Other Pokémon hear his cry and jump up, to see him roll away. Astonished, they run after the baby, calling him, yet hard to keep up with him. He rolls and rolls, and finally, falls into a hole of a tree stump. Pokémon reach there, look into the hole and call Togepi, but there is no reply. They worry about him, and are puzzled to figure out what to do to save him. At that time, Psyduck, who has arrived a minute behind, cannot stop after running down the steep and clash against other Pokémon. All of them are sent to the hole, falling to kick and struggle. But Redibas hold them, and with them on their backs, they fly to a big tree and send them to a branch of it. It is Pokémon valley, and they see a Pokémon Elekid there, who speaks to them in the not so familiar manner. Pikachu gives him a brief explanation that they are looking for their friend, trying to solve his heart. He understands Pikachu, and, to Pikachu's delight, decides to help him and his friends.

They can find Togepi in a nest of Exeggcute soon. Togepi is delighted, as Pikachu and his friends are, and hops out of the nest to go back with them. However, Exeggcute also follow out, making them note that one of them lacks, and they need Togepi for it. Pikachu and his party decide to look for their friend, and led by Elekid, they starts.