The progression of Haunter to its subsequent form, Gengar, is a unique process dependent on a specific in-game mechanic. This transformation doesn’t rely on traditional level-up systems or item usage alone, distinguishing it from many other evolutions within the game. For instance, a player cannot simply raise Haunter to a certain level or administer a particular stone to achieve this evolution.
Successfully obtaining this advanced form offers several advantages. Gengar is a powerful Ghost/Poison-type Pokmon, highly sought after for its offensive capabilities and speed. Its unique typing grants it resistances and immunities to certain move types, making it a valuable asset in battles. Historically, this method of obtaining Gengar has been a consistent feature across multiple iterations of the core series games, adding a layer of complexity and interaction amongst players.