Gastlys

Gastly is a species of Pokémon in the Pokémon franchise. It is a Ghost/Poison-type first introduced in Generation I. In its evolutionary line, Gastly evolves into Haunter starting at level 25; Haunter evolves into Gengar when traded.

Physically, Gastly appears as a round, purple-black ball of gas with a large mouth lined with fangs and two hollow eyes. It is surrounded by a purple haze and can slip through walls and other solid matter.

Gastly is described as a gas-filled Pokémon that forms from poisonous gases. It haunts haunted buildings and shadowy areas, drifting through walls and luring people with its eerie appearance.

In battles, Gastly tends to function as a special attacker, using Ghost- and Poison-type moves to target opponents’ weaknesses. It is often chosen by players early in the game for its versatility and the potential to evolve into stronger members of its line.