Gengar

Gengar, the Shadow Pokémon, is a Ghost/Poison-type from the Kanto region, introduced in Generation I. It is the final evolution of Gastly, evolving from Haunter. Gengar is known for its mischievous and sometimes malevolent nature, often depicted hiding in shadows, mimicking people's shadows, or causing cold spots in rooms. Its Pokédex entries frequently mention its ability to steal the lives or shadows of its victims, a chilling yet iconic aspect of its lore. In the games, Gengar is a fast special attacker with a wide movepool, making it a formidable opponent. In the anime, it's often portrayed as playful but still capable of causing trouble, notably befriending Ash's Gengar. Gengar's design, a grinning, shadowy figure, has made it one of the most recognizable and popular Pokémon since the franchise's inception, embodying the spooky yet charming essence of Ghost-type Pokémon. Its cultural significance extends beyond games and anime, appearing in various merchandise and even as a popular choice for Halloween costumes.