• English / United States: Morty's Gengar
• Japanese / Japan: マツバのゲンガー
• Japanese (Romanized) / Japan: Matsuba no Gangar
• Japanese (TL) / Japan: Matsuba's Gangar

Morty's Gengar was first seen in the Burned Tower, creating an illusion with other Haunter and Gastly to deceive Ash Ketchum and the rest of the group into thinking that the tower was aflame and burning to the ground. Morty notes that many challengers believe that the Burned Tower is actually the Ecruteak City Gym, so the Ghost-type Pokémon attempt to ward off the trespassers by creating illusions. Later on, Morty's Gengar battled and defeated Jessie's Arbok and James's Weezing, retrieving Ash's Pikachu and Misty's Togepi for Ash Ketchum and Misty, respectively.

Before the Ecruteak City Gym Battle against Ash Ketchum , Gengar was seen helping Morty demonstrate the deceptive powers of Ghost-type Pokémon to the students of the gym by using Confuse Ray on a group of Gastly. Gengar was the third and final Pokémon used by Morty in the gym battle, facing off against Ash's Noctowl. Ash's Noctowl started the match with a Confusion attack, but Gengar countered using Shadow Ball. Gengar's invisibility made it difficult for Ash's Noctowl to use Foresight, so Ash's Noctowl used a wide-range Confusion attack to stun Gengar. Then, Ash's Noctowl was able to use Foresight and expose Gengar. Gengar attempted to counter with a Shadow Ball, but Ash's Noctowl was too quick and hit with a Tackle attack for the victory, defeating Gengar and giving victory in the Ecruteak City Gym Battle to Ash Ketchum.