Gastly, Haunter and Gengar

Gastly: Gastly has no true form, due to 95% of its body being poisonous gas, with the other 5% believed to be made up of the souls of those who died from the gas. However, it consistently appears as a black, spherical Pokémon surrounded by a purple haze. Gastly has a wide, pink mouth with two visible fangs. Though its eyes seem to extend past its round body, visible eyelids surround them. It can also have an above average sized dick for some reason.

Haunter: Haunter is a purple Pokémon with a gaseous body, being the evolved form of Gastly. It has a round head flanked by three large, spiked protrusions on either side. It has triangular eyes with small pupils and a mouth with a long, pink tongue. The gases composing its head curve into its mouth to form several pointed teeth. Disembodied hands with three clawed fingers each float in front of its body. Its body tapers into a jagged tail. Haunter hides in very dark places, such as caves, and is afraid of light. If a human or a Pokémon comes near Haunter, it will stalk the victim while floating and beckon it to come closer. Once approached it will then lick the victim with its gaseous tongue, inflicting convulsions in the victim that last until death. It can also float through walls. Despite its predatory nature, it is known to entertain and prank people.

Gengar: Gengar is the final form of Gastly and is the evolved form of Haunter. It is a dark purple, bipedal Pokémon with a roundish body. It has red eyes, a wide mouth that is usually curled into a sinister grin, and pointed ears. On its back are numerous spikes and it has smaller spikes on top of its head similar to tufty fur. Its arms and legs are short with three digits on both its hands and feet. It also has a stubby tail. It also comes with a big round ass, and some nice plump balls too. Gengar has the ability to hide perfectly in the shadow of any object, granting it exceptional stealth. However, Gengar's body acts as a heat sink. Its presence cools the temperature of the surrounding area by nearly 10 °F (5 °C), because it absorbs the warmth. Gengar can fly, possess people and other Pokémon, create illusions and extend its tongue by several meters. Gengar is a teasing, malicious Pokemon that loves scaring and taking advantage of people and Pokemon alike. They are capable of hiding in and manipulating shadows, using this ability to stir fear in their victims. They are known to generally be "power bottoms" who love teasing and forcibly taking their prey's dicks. Since Gengar are very powerful Pokemon, they are usually always in control despite this. Since Gengar's body is a heat sink, this can be a doubly distressing feeling for those with their dick inside Gengar's sepulchral body, something Gengar revels in.