Haunter

Haunter (ゴースト Ghost) is a /-type Pokémon and is the evolved form of Gastly, which evolve into Haunter starting at level 25.

Haunter can evolve into Gengar at any given level when it is traded.

Appearance
This Pokémon takes the shape of an angular floating face with disembodied hands. It has a sinister look, along with fangs and claws. However, when approached by people, it has a habit of reverting to a spherical form that obscures its eyes, mouth, and hands.

Special Abilities
Haunter can have the ability Levitate, which cause all -type moves to miss. It licks with its gaseous tongue so getting close is dangerous. Because of it's ability to slip through solid walls, it is thought to be from another realm. It enjoys scaring people and revealing horrible nightmares of their worst fears to them while taking pleasure in it. It is also though to steal the souls of those who envy, so it is highly recommended that you keep your distance.

Anime
Ash caught a Haunter in order to defeat Sabrina. In his second battle, Haunter caused Sabrina to laugh with its constant pranks. After this, Sabrina gave Ash the Marsh Badge, and Haunter was given to Sabrina.