Gengar does not have an official canonical “birthday” in Pokémon media; no specific date is given in games, anime, or official reference sites.

Quick Scoop

  • Major databases that track character traits for Gengar explicitly list its birthday as “None” , meaning no set date exists.
  • Official Pokédex style resources focus on Gengar’s type, lore, and behavior, but do not mention any birth date.
  • Fan forums and fan-made celebrations sometimes pick fun dates (often around Halloween, like late October), but these are community headcanons, not official canon.

So what do fans use?

Because there is no official answer to “when is Gengar’s birthday” , fans often:

  1. Use Halloween (October 31) as a symbolic “birthday” because of Gengar’s ghostly theme.
  1. Tie it to the release year of the first Pokémon games (1996) for nostalgic celebrations, without a fixed day.
  1. Create personal or community-specific “Gengar birthday” events on forums and social servers, which are clearly fan-made.

If you want to celebrate

If you are planning a post, event, or forum topic:

  • The most on-theme choice is Halloween, since Gengar is strongly associated with spooky, ghostly imagery and moonlit shadows.
  • You can also declare your own “Gengar’s birthday” date for your community or OC, as there is no canon date that you would be contradicting.

In short: there is no official Gengar birthday, so you are free to pick a date—Halloween is the most popular fan choice.

Information gathered from public forums or data available on the internet and portrayed here.