Haunter

Haunter (Japanese: ゴースト Goosuto) is a /-type Pokémon introduced in Generation I. It evolves from Gastly starting at level 25 and evolves into Gengar when traded.

Anatomy
Haunter is a purple, spiky, floating figure with triangular eyes, tiny pupils, fangs and disembodied, clawed hands.

Characteristics
Haunter can pass through solid walls. It is because of this that it is believed it is from another dimension. It can also sap away the life force of a target by licking them with its tongue.

By leveling up
Generation VI=

Generation V=

Generation IV=

Generation III=

Generation II=

Generation I=

In the anime

 * Sabrina's Haunter
 * Captain's Haunter
 * Haunter (JE005)
 * Morty's Haunter
 * Haunter (JE158)
 * Lon's Haunter

Pokémon Adventures

 * Eusine's Haunter

Golden Boys

 * Black's Haunter
 * Eusine's Haunter