Gengar

Gengar is a Ghost/Poison-type Pokémon that is known to live(?) in most regions. It evolves from Haunter when traded. It is said to emerge from darkness to steal the lives of those who become lost in mountains. It steals heat from its surroundings, so a sudden temperature drop of nearly 5°C is an indication that it is nearby. It enjoys cursing people and has a tendency to scare them by pretending to be shadows and laugh at their fright, especially on the night of a full moon. It hides in whatever shadows it can find, such as dark corners of rooms. It also slips into the shadows of its victims at night, absorbing their heat and making them shake, as it waits for an opportunity to steal their life force. It apparently wishes for a traveling companion and tries to create one by taking the lives of other humans, since it was once human itself.