Rocket's Secret Experiment
- Rarity
- Uncommon
- Released
- Jun 25, 1998
Sold price movement
- 12 months ago
- $1.75£1.31€1.53
- Today
- $2.50£1.87€2.18
- Change
- +$0.75+£0.56+€0.65 (+42.9%)
Market activity
| Price type | Pop share | PopulationPop | Sold 90d | Median | Price |
|---|---|---|---|---|---|
| Raw | – | 14 | $2.12£1.59€1.85 | $2.50£1.87€2.18 | |
| PSA 5 | 2 | – | – | – | |
| PSA 6 | 4 | 1 | – | – | |
| PSA 7 | 2 | – | – | – | |
| PSA 8 | 10 | 1 | – | $17.50£13.11€15.27 | |
| PSA 9 | 33 | 7 | $21.20£15.89€18.50 | $20.10£15.06€17.54 | |
| CGC/BGS 9.5modelled | – | – | – | $22£16.49€19.20 | |
| PSA 10 | 13 | 1 | – | $156£116.90€136.13 | |
About these prices
20.3% of copies sent to PSA come back a 10. Sold and median are 90 days of PSA sales. The 9.5 is a CGC and BGS grade, so it carries no PSA population.
Priced from 72 completed sales, updated Sep 13, 2026.
Price history
Recent sales
72 completed listings on eBay, Fanatics Collect, Goldin AuctionsShow 60 more
Rocket's Secret Experiment Challenge from the Darkness Japanese Pokemon LP Japanese$3.99£2.99€3.4891999 Pokemon Japanese Gym 2 Rocket's Secret Experiment Trainer PSA 9 Japanese 120/132$20£14.99€17.45Challenge from the Darkness Rocket's Secret Experiment Japanese Pokemon MP$1.59£1.19€1.3981999 Pokemon Japanese Gym 2 Rocket's Secret Experiment Trainer PSA 8 NM-MT Japanese$17.50£13.11€15.2710Pokemon Card Japanese Rocket's Secret Experiment PSA 10 GEM MINT Gym Series 2 Japanese$186.99£140.13€163.17Rocket's Secret Experiment Pokemon Japanese Challenge From The Darkness - NM Japanese$3.99£2.99€3.48Rocket's Secret Experiment Challenge from the Darkness Regular Japanese Pokemon Japanese$1.49£1.12€1.30ROCKET'S SECRET EXPERIMENT - CHALLENGE FROM THE DARKNESS - JAPANESE POKEMON CARD Japanese$0.99£0.74€0.86Pokemon Card Japanese Rocket's Secret Experiment Challenge from the Darkness Japanese$2.98£2.23€2.60Rocket's Secret Experiment Japanese Challenge From The Darkness Pokemon TCG Japanese$0.99£0.74€0.86Rocket's Secret Experiment Challenge from the Darkness Regular Japanese Pokemon Japanese$1.49£1.12€1.30Pokemon Rocket's Secret Experiment Trainer Gym 2 (Challenge) Japanese 1999 Japanese$0.99£0.74€0.861999 Japanese Pokemon Gym 2 Challenge Rocket's Secret Experiment Trainer MINT Japanese$1.75£1.31€1.531999 Japanese Pokemon Gym 2 Challenge Rocket's Secret Experiment Trainer MINT Japanese$1.29£0.97€1.131999 Japanese Pokemon Gym 2 Challenge Rocket's Secret Experiment Trainer MINT Japanese$1.59£1.19€1.39Rocket's Secret Experiment Pokemon Japanese Gym Challenge Gym 2 Pokemon Card NM Japanese$3£2.25€2.62Pokemon Rocket's Secret Experiment Challenge from the Darkness Uncommon Japan LP$2£1.50€1.75Rocket's Secret Experiment Pokemon Japanese Gym Challenge Gym 2 Pokemon Card NM Japanese$1.65£1.24€1.44Japanese Pokemon Rocket's Secret Experiment (CFTD) Challenge from the Darkness$5.19£3.89€4.53Rocket's Secret Experiment - Trainer - Pokemon Card Gym 2 Challenge Japanese -MP$4.06£3.04€3.54Japanese Pokemon Card - Rocket's Secret Experiment - Challenge from the Darkness #120$2.43£1.82€2.121999 Pokemon Japanese Challenge from the Darkness Rocket's Secret Experiment$4.88£3.66€4.26Rocket's Secret Experiment Challenge From the Darkness Japanese Pokemon Card PL$1.99£1.49€1.74Rocket's Secret Experiment 120/132 Gym Challenge JAP WOTC Pokemon Cards TCG NM 105/132$15.96£11.96€13.936Cert 76039476Goldin Auctions · Auction$6£4.50€5.241999 Pokemon Japanese Challenge from the Darkness Rocket's Secret Experiment$3.01£2.26€2.639Cert 52157091Auction$55£41.22€47.99More from Japanese Challenge from the Darkness
All 99 cards →
Rocket's Mewtwo
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Erika's VenusaurGrading odds
PSA has graded 92 copies. Where they landed:
Why the verdict weights the odds
Only 23.9% of copies reach a 10, which is why the top price is the wrong number to plan around. Weighting each grade’s PSA price by these odds, a submission is worth $50.67£37.97€44.22 on average against $102.49£76.80€89.43 for the card plus $79.99£59.94€69.80 at Regular, the cheapest level PSA will insure it at. That loses $51.82£38.83€45.21, so a copy is worth more raw.
1 of the 4 grades priced above had no sales at that grade, so the figure is modelled from the grades that did rather than observed.
Card facts
- Card number
- –
- Rarity
- Uncommon
- Set released
- Jun 25, 1998
- PSA population, all printings
- 92
- Printings priced
- 1
Challenge from the Darkness99 cards- Complete set value
- $2.1k£1.6k€1.8k
- 7 day move
- +0.5%
What moves the price of this card
The Rocket's Secret Experiment on this page is the Normal printing from Japanese Challenge from the Darkness, and it trades at $4.19£3.14€3.66 in near mint condition. Only one printing of this card was produced, so there is no cheaper version to confuse it with.
Graded, it runs PSA 8 $17.50£13.11€15.27, PSA 9 $20.10£15.06€17.54, CGC/BGS 9.5 $22£16.49€19.20, PSA 10 $156£116.90€136.13. PSA has graded 92 copies of it. 72 completed sales are on file.
What is a PSA 10 Rocket's Secret Experiment worth?
A PSA 10 Rocket's Secret Experiment from Japanese Challenge from the Darkness sells for $156. 20.3% of the copies PSA has graded came back a 10, so that price is the best case rather than the one a submission should expect.
Is Rocket's Secret Experiment from Japanese Challenge from the Darkness worth grading?
On the numbers, no. The average submission is worth $45.02 with every grade weighted by how often this card comes back at it, against $2.50 for a raw copy plus $99.99 to send it through PSA Regular, so it loses $57.47.
Condition does most of the work below the surface. A copy with soft corners or a print line off centre trades well under the market price shown here, and a copy clean enough to grade trades well above it, which is why the PSA 10 sits at $156£116.90€136.13. Before you value your own copy, look at the corners under a light and check the centring on the back, where most cards give themselves away.