Pokémon sets › Gym Heroes [1st-Edition] › Brock's Onix [1st-Edition]

Gym Heroes [1st-Edition] Brock's Onix [1st-Edition] Pokémon card

Brock's Onix [1st-Edition] #21

Gym Heroes [1st-Edition] · 2000 · Rare

Ungraded · US

$15.55

PSA 10 · US

$405.00

Ungraded · UK

£18.97

PSA 10 · UK

£298.89

Low confidence 39th most valuable of 132 priced cards in Gym Heroes [1st-Edition]

Rough guide — limited market data — pre-2010 condition spread.

Built from United States market data — recent sales of this card in that market, refreshed weekly.

A PSA 10 of this card sells for about 26.0× the ungraded price — $15.55 raw against $405.00 graded.

We began recording US prices as their own series in August 2026, so there are not yet enough readings to chart a US trend for this card. It will appear here as they accumulate.

US guide prices, with the UK 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 US sold prices on eBay →

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