Poison-Type Pokémon are a category of creatures in the Pokémon universe known for their toxic abilities. They often use poison to weaken opponents or defend themselves. Many of these Pokémon can inflict status conditions like poisoning, which gradually reduces an opponent's health over time. These Pokémon are typically characterized by their green or purple colors and are often associated with plants, toxins, or hazardous environments. In battles, they are effective against Fairy and Grass-Type Pokémon, but they are vulnerable to Psychic and Ground-Type Pokémon.