Terapagos, the Legendary Pokémon released in the Indigo Disk DLC, is thought to be inspired by the mythical creature known as the World Turtle, which was believed to carry the whole world on it's back. It appears in Chinese, Indian and Native American mythology.
The "World Turtle" aspect of Terapagos is highlighted by it's Stellar Form, which resembles a huge globe. It's shell also looks like the Paldea region, with the star marking at the top appearing as the Great Crater.
Terapagos's name comes from the conjunction of the word "Tera" (meaning "Earth") and Galapagos, a species of tortoise in the East Pacific. This makes it's name perfectly translate as "World Turtle", underlining its connection to the myth.