Pokémon sets › Gym Challenge [1st-Edition] › Rocket's Secret Experiment [1st-Edition]

Gym Challenge [1st-Edition] Rocket's Secret Experiment [1st-Edition] Pokémon card

Rocket's Secret Experiment [1st-Edition] #120

Gym Challenge [1st-Edition] · 2000 · Uncommon

Ungraded · UK

£9.11

PSA 10 · UK

£77.96

Ungraded · US

$7.47

PSA 10 · US

$105.64

Medium confidence 73rd most valuable of 132 priced cards in Gym Challenge [1st-Edition]

Solid guide price from market data — pre-2010 condition spread, liquid, well-sampled card.

Priced against the UK market and refreshed weekly — adjusted where UK collectors reliably pay above the US average. We have not yet seen enough recent UK activity for this card to read it directly.

A PSA 10 of this card sells for about 8.6× the ungraded price — £9.11 raw against £77.96 graded.

UK ungraded · 18 readings, May 2026 to Aug 2026 -8.4%

30 days+32.0% 90 days-13.1%

Peaked at £10.52 in June 2026; lowest £6.14 in June 2026. PSA 10 moved -0.4% over a comparable period.

UK price month by month

Month	UK ungraded
May 2026	£10.48
June 2026	£6.58
July 2026	£6.90
August 2026	£9.11

UK guide prices, with the US market alongside — updated 30 August 2026. Each market is priced from real market data in that market. Estimates for collection tracking — not an appraisal or a quote.

Check recent UK sold prices on eBay →

Own this card? Scan it free Track your collection

No account needed to scan — point your camera and Cardfolio values it in about a second.