About Rocket's Secret Experiment
Rocket's Secret Experiment from the Challenge from the Darkness set (#PROMO) is a Pokemon trading card released in 1999. Current fair market values for Rocket's Secret Experiment are PSA 10: $186.99, PSA 9: $20.10, PSA 8: $17.50, Raw: $2.54. The most recent PSA 10 sale was $186.99 on March 9, 2026, with 2 sales tracked in the last 30 days. The most recent PSA 9 sale was $20.10 on August 23, 2026. A raw (ungraded) copy last sold for $2.54 on July 22, 2026. CardIndex has tracked 33 total sales across all grades for this card.
