Grass-type Pokémon are a category of creatures in the Pokémon franchise known for their plant-like characteristics. They often have abilities related to nature, such as healing or manipulating plants. Grass-types are typically strong against Water, Ground, and Rock types, making them effective in battles against these categories. However, Grass-type Pokémon are vulnerable to Fire, Flying, Bug, Ice, and Poison types. This means they can be easily defeated by these opposing types in battles. Many Grass-type Pokémon also have moves that can restore health or create barriers, emphasizing their connection to nature and growth.