Gengar is a dark purple, furred Pokémon with a roundish body. Gengar's hands now connect to the rest of its body. In addition, it now has a pair of legs and a short, pointed tail. Gengar has a spiky fur-covered back. Gengar's eyes are now red, and its mouth is usually curled into a sinister grin.
Gengar have the ability to hide perfectly in the shadow of any object, granting it exceptional stealth. However, Gengar's body acts as a heat sink; its presence cools the temperature of the surrounding area by nearly 10°F, because it took the warmth. In addition, Gengar possesses the ability to fly through the air. Since Gengar is a fully evolved Pokémon, it can use Hyper Beam and Giga Impact.
Gengar are very mischievous, and at times, malicious. They enjoy playing practical jokes, such as pretending to be one's shadow, then behaving erratically. When the quarry notices, the Gengar takes delight in its victim's terror. However, Gengar have been known to be loyal to Trainers that treat them well; the smile is less mischievous and friendlier in this case. Gengar may also cast curses.
Gengar live in shadows of rooms, caves, and dark places where shadows form, especially in urban areas such as cities and back alleys but only during the night. Gengar are also known to live in mountains. It normally shares its range with Gastly and Haunter, but reports of wild Gengar are not unheard of.
Gengar drains the life force from its victims. It may also eat its victim's dreams. Like its pre-evolution, Haunter, it may lick its prey to drain the life force.
This Pokémon was unavailable prior to Generation I.