Black Fog is an giant alternate version of Haunter which appears once in the manga, and once in the anime main series (where it is referred to as Ghost), as well as in Generations.
Black Fog appears as a Giant Haunter, in the manga it appears with a much spikier appearance than regular Haunter and it's claws and teeth appear sharper. In the anime it has red glowing eyes.
A Giant Haunter, which only referred to itself as Ghost (Haunter's Japanese name), appeared in Fear Factor Phony, Haunter transformed into this form by merging with several other Ghost-types, including two Gastly, two Duskull, and a Shuppet.
In The Old Chateau, a giant Haunter appeared in the Old Chateau after the butler's ghost disappeared, appearing from a massive cloud of darkness and lightning, it chased Cheryl and her Chansey, and apparently consumed them. However they soon woke up elsewhere, wondering what happened.
Electric Tale of Pikachu
- Main article: Black Fog (ETP)
Black Fog makes it's debut in the Electric Tale of Pikachu, it appears as a Legendary Pokémon that was worshiped in ancient times. Black Fog killed many of the humans and Pokémon living in Lavender town until Ash came to capture it, it self destructed to avoid capture.