Nightmare 6 is a card from the Apple II set for the Pokémon Chinese game, listed with an n/a rarity and a current market value of $0.00. Collectors view it as a niche piece tied to an early regional release rather than a mainstream playable card. Grading data and sales records appear limited, which contributes to its low market liquidity. As a result, it is typically sought for completionist sets or historical interest rather than investment.