| Pokedex Entries: |
| Red | Under a full moon, this Pokémon likes to mimic the shadows of people and laugh at their fright. |
| Blue |
| Yellow | A Gengar is close by if you feel a sudden chill. It may be trying to lay a curse on you. |
| Gold | It steals heat from its surroundings. If you feel a sudden chill, it is certain that a GENGAR appeared. |
| Silver | To steal the life of its target, it slips into the prey's shadow and silently waits for an opportunity. |
| Crystal | Hiding in people's shadows at night, it absorbs their heat. The chill it causes makes the victims shake. |
| Ruby | Sometimes, on a dark night, your shadow thrown by a streetlight will suddenly and startlingly overtake you. It is actually a GENGAR running past you, pretending to be your shadow. |
| Sapphire |
| Emerald | Deep in the night, your shadow cast by a streetlight may suddenly overtake you. It is actually a GENGAR running past you, pretending to be your shadow. |
| FireRed | It is said to emerge from darkness to steal the lives of those who become lost in mountains. |
| LeafGreen | Under a full moon, this Pokémon likes to mimic the shadows of people and laugh at their fright. |
| Diamond | It hides in shadows. It is said that if GENGAR is hiding, it cools the area by nearly 10 degrees F. |
| Pearl | Lurking in the shadowy corners of rooms, it awaits chances to steal its prey's life force. |
| Stadium 1 | Appears to attack people who get lost in the mountains. Said to be the culprit behind shadows that laugh in the moonlight. |
| Stadium 2 | It steals heat from its surroundings. If you feel a sudden chill, it is certain that a GENGAR appeared. |
| TCG | Dark Gengar: It absorbs the heat in the air around it. If you suddenly feel cold, it's because a Gengar has appeared. |
