Onix is a type of rock snake Pokémon known for its immense size and strength. Its body is made up of large boulders and rocks, giving it a tough and durable exterior. Onix is known to burrow through the ground and travel long distances underground. Despite its intimidating appearance, Onix is actually a gentle and loyal Pokémon when trained by a skilled trainer. It evolves from a smaller Pokémon called Geodude, gaining even more power and endurance in its larger form. Overall, Onix is a formidable and unique Pokémon that can be a valuable asset in battles.