The story takes place with Pikachu inside a forest after being sent to PokéPark by Mew. Pikachu ventures out through the forest and encounters one of his friends, Chikorita. Outside the forest, they meet Bulbasaur and challenges Bulbasaur's attraction. However, after winning and receiving the prism piece, Chikorita is kidnapped by Treecko and Mankey who is taken to the park keeper, Venusaur.
Pikachu strolls around Meadow Zone and encounters the front gate to Venusaur's den. However, it is guarded by Treecko and Mankey, whom Pikachu challenges to get through to the den. Once defeated, Pikachu enters the den and finds Venusaur with Chikorita. Venusaur then asks Pikachu to challenge his attraction in return for Chikorita and a prism piece. Once Pikachu defeats Venusaur's attraction, he is now told to settle a dispute with the other park keepers, Empoleon and Blaziken; Pikachu now has access to the Meeting Place.
Venusaur's Vine Swing is a targeting game where the Pokémon must build up speed while hanging on a vine. The Pokémon releases from the vine and lands. The longer they are from the starting point, the better.
To swing the vine, flick the Wii remote in time to build up speed.