GROUDON has long been described in mythology as the POKéMON that raised lands and expanded continents. This POKéMON took to sleep after a cataclysmic battle with KYOGRE.
GROUDON has the power to scatter rain clouds and make water evaporate with light and heat. It came as a savior to people who had been suffering from terrible floods.
GROUDON has appeared in mythology as the creator of the land. It sleeps in magma underground and is said to make volcanoes erupt on awakening.
This legendary POKéMON is said to represent the land. It went to sleep after dueling KYOGRE.
It had been asleep in underground magma ever since it fiercely fought KYOGRE long ago.
— Pokédex entries (via PokeAPI)