Rock-type Pokémon are a category of creatures in the Pokémon universe known for their strong defensive abilities. They often resemble rocks, stones, or geological formations and are typically resistant to many types of attacks. Their high defense makes them valuable in battles, especially against physical moves. These Pokémon are weak against Water, Grass, Fighting, Ground, and Steel types, meaning they take more damage from these attacks. Some popular Rock-type Pokémon include Onix, Geodude, and Tyranitar. Trainers often use Rock-type Pokémon for their durability and powerful Rock-type moves, which can deal significant damage to opponents.