Gengar was first seen in A Ghost of a Chance and was usually seen outside its Pokeball. It liked to play tricks on people but was loyal to its trainer. Gengar was used to defeat Team Rocket when they tried to steal Ash's Pikachu.
Morty later used Gengar during his Gym battle with Ash. Gengar battled Ash's Noctowl and displayed the ability to attack even while it was invisible. While Noctowl desperately avoided Gengar's Night Shade attacks, Ash came up with an idea and ordered Noctowl to send its newly learned Confusion through the whole gym. Noctowl then used Foresight to make Gengar solid. Gengar tried to counter with Shadow Ball but Noctowl was too fast and slammed into the Ghost Pokémon with a Tackle attack, defeating Gengar.
Gengar was seen in For Ho-Oh the Bells Toll, where it helped find the crystal bells that Team Rocket had stolen.
|Shadow Ball||A Ghost of a Chance|
|Night Shade||A Ghost of a Chance|
|Lick||A Ghost of a Chance|
|Confuse Ray||For Ho-Oh the Bells Toll|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.