Brock's Onix (1st Edition)
Gym Heroes (1st Edition) - 21/132
Purchase price
Quantity
Purchase price
Quantity
Market prices
Brock's Onix (1st Edition) 21/132 from Gym Heroes (1st Edition) sells for $19.66 ungraded: the median of 8 completed sales over the last 30 days, as of October 3, 2026. Graded copies: PSA 10 at $364.76 (1 sale).
Graded population: PSA 304 copies (17.4% in 10), CGC 113 copies (10.6% in 10), and BGS 6 copies, as of October 1, 2026.
Ungraded
Median by period. Short periods can rest on a handful of sales: the count is shown next to each price, and prices marked “est.” are indicative.
Graded Prices
PSA
| Grade | Median | Sales |
|---|---|---|
| PSA 10 | $364.76est. | 1 sale |
| PSA 8 | $16.01est. | 1 sale |
Actual prices may vary.
Graded population report — Brock's Onix (1st Edition) #21
Updated monthly · as of September 2026
PSA
| Grade | Pop |
|---|---|
| 10 | 53 |
| 9 | 140 |
| 8 | 78 |
| 7 | 22 |
| 6 | 4 |
| 5 | 4 |
| 4 | 2 |
| Authentic | 1 |
CGC
| Grade | Pop |
|---|---|
| Pristine 10 | 1 |
| Gem Mint 10 | 11 |
| 9.5 | 3 |
| 9 | 38 |
| 8.5 | 36 |
| 8 | 12 |
| 7.5 | 6 |
| 6.5 | 1 |
| 6 | 2 |
| Authentic | 3 |
BGS
| Grade | Pop |
|---|---|
| 9.5 | 1 |
| 9 | 5 |
Card details
Types
—
Attacks
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Flip a coin. If heads, the Defending Pokémon is now Paralyzed.
If your opponent has any Benched Pokémon, choose up to 2 of them. This attack does 20 damage to each of them. (Don't apply Weakness and Resistance for Benched Pokémon.) Brock's Onix can't attack during your next turn.
Weaknesses
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