Bulbasaur's Mysterious Garden

Ash and his friends head towards the Pokémon Gym on Cinnabar Island. Along the way, they see many Bulbasaurs in the evening, which Ash's Bulbasaur follows. The friends follow the Pokémon as well. They arrive at the heart of a mysterious garden. Thousands of Bulbasaur are in the garden. Suddenly, a tree opens and a Venusaur appears. Together, they perform a ritual to evolve the little Bulbasaur into Ivysaur. However, Misty is discovered and helps the Pokémon with the ceremony.