Brock's Onix #21

Market structure summary: Short-term movement is stable (0.0% over 7 days), with price action clustered near recent averages. With a 9% 90-day spread ($12.24-$13.33), this card currently tracks as low-volatility.

Versus the 30-day average ($12.98), the card is trading 4.5% lower. Top-grade copies show substantial separation from raw: PSA 10 is pricing +860% above the current raw benchmark.

PSA 9 is currently around $18.00, while PSA 10 is $119.01.

Latest market snapshots place Brock's Onix in Gym Heroes at roughly $12.40. Week-over-week change is limited (0.0%), indicating short-term stability.

It is currently 4.5% below the 30-day average of $12.98. The 90-day window shows a floor near $12.24 and a peak around $13.33 (9% total spread), which maps to low-volatility movement.

The listed rarity for this print is Rare.

Brock's Onix appears in Gym Heroes, released in 2000. Its card type is Pokémon.

The rarity label is Rare. Printed HP is 70.

Energy typing is Fighting. This print is categorized under the Basic subtype.

Notable move text references "Bind" and "Tunneling". It is weak to Grass type energy.

Gym Heroes entered circulation in 2000. It belongs to the Gym series.

With 132 listed cards, this is a mid-size set by modern TCG standards. As of 2026, the set is 26 years old and fits a legacy-era profile.

In the Gym Heroes checklist, Brock's Onix occupies position #21 as a Rare card.

Collectors tracking Brock's Onix often benchmark it against other Brock's cards. This comparison sample includes 1 alternatives across 1 set.

Only one priced comparison is available in this sample ($0.75). Notable alternatives include Brock's Onix #69 (Gym Heroes) at $0.75.