Celebi

Celebi, the Time Travel Pokémon, is a mythical Psychic/Grass-type Pokémon introduced in Generation II. Known as the "Voice of the Forest," Celebi is revered as the guardian of forests, capable of traveling through time to ensure the growth and rebirth of vegetation. It is said to appear only in peaceful times and its presence signifies a bright and prosperous future. Celebi does not have an evolution line, existing as a standalone mythical Pokémon, a characteristic it shares with other legendary figures like Mew and Jirachi. In the games, Celebi is often tied to special events and plotlines involving time travel, such as in Pokémon Gold, Silver, and Crystal, where it plays a role in the Ilex Forest shrine. In the anime, it has starred in movies like "Pokémon 4Ever," where its time-traveling abilities and connection to the forest are central to the narrative. Its unique ability to heal and restore nature, combined with its elusive nature, makes it a symbol of hope and renewal in the Pokémon world. Its Psychic/Grass typing gives it vulnerabilities to Fire, Flying, Poison, Bug, Ghost, and Dark-type attacks, while it resists Fighting, Ground, Water, Grass, Electric, and Psychic-type attacks.