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Rocket's Secret Experiment.

Gym Challenge · 120/132 · Uncommon
updated Aug 14, 2026
Rocket's Secret Experiment 120/132 from Gym Challenge
Raw market value · 1st Edition
$9.66.
near mint, ungraded7 day – · 30 day –
Price by printing
1st Editionthis page$9.66
Unlimited$4.18
Check live eBay pricesPrices above are what copies actually sold for, not what sellers are asking.

Price history and graded value

monthly median sold price
$3.2$10$32$100SEP '21MAY '23DEC '24AUG '26

Grading odds

PSA has graded 18 copies. Where they landed:

PSA 1011.1%
PSA 938.9%
PSA 822.2%
PSA 716.7%
6 or lower11.1%

1 of the 3 grades priced above had no sales at that grade, so the figure is modelled from the grades that did rather than observed.

Not worth grading
$39.99
top slab, best case

A PSA 10 sells for $39.99 against $4.28 raw plus a $25 fee. Without a population report we cannot weight that by the odds, so treat it as the best case: most submissions come back below the top grade.

More from Gym Challenge

All 132 cards →
Blaine's CharizardBlaine's Charizard$699.99Blaine's ArcanineBlaine's Arcanine$364.86Misty's GyaradosMisty's Gyarados$348.33Rocket's MewtwoRocket's Mewtwo$323.33Giovanni's GyaradosGiovanni's Gyarados$321.99Erika's VenusaurErika's Venusaur$300.72

What moves the price of this card

The Rocket's Secret Experiment on this page is the 1st Edition printing from Gym Challenge, and it trades at $9.66 in near mint condition. The other 1 printing of the same card sits lower, which is normal: the scarcer print run always carries the premium.

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 $39.99. 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.