Brock's Onix

Gym Heroes · #21/132 · Rare · 2000

All 74 Onix cards ranked by value →

$17.36

1st Edition · 21 · Market price ▲ 1.3% (30d)

Prices as of Nov 7, 2026

21 1st Edition · 21

HP 70FightingBasicArt · Benimaru Itoh

199graded pop

14%gem rate

20.5×PSA 10 vs raw

-41%off ATH $19.62 · Sep 2026

+$16.61EV to grade — marginal

Market data

Printings & price history

1st Edition · 21▲ 0.0% 7d$17.36

Low $11.45Mid $22.38

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Live listings

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Graded market

Graded values

PSA 10 report →updated 2026-11-07

Grade 6 est.$18.13

Grade 5 est.$15.26

Grade 4 est.$12.59

Grade 3 est.$10.49

Grade 2 est.$8.59

Grade 1 est.$7.25

Grades 1–6 are estimates modeled from the raw price — PSA/CGC/BGS 7–10 and Ungraded are live tracked market values.

1st Edition · PSA 10 price history$405.00

PSA 10 chart is building — graded values are tracked nightly, a new point appears each day.

Graded population census · updated 2026-09-17

1st Edition

PSA294 graded · 53 gem 10

12345678910

CGC105 graded · 12 gem 10

12345678910

Population data from PriceCharting, updated monthly.

Auction sale integrity

New

Graded sales for this card from public auctions, each checked for shill/relist patterns and prices that don’t match the market. How this works →

Clean price · CGC 8.5

$8.40

Medium confidence — 2 sales

Recent sale price by grade · tracked by cert number

CGC 10

$22.00

last $22.00 · Aug 17, 2026 · 1 sale

CGC 8.5

$7.00

last $7.00 · Sep 21, 2026 · 2 sales

CGC 5

$6.00

last $6.00 · Aug 31, 2026 · 1 sale

CGC 10 · 1st Ed

$39.00

last $39.00 · Sep 7, 2026 · 1 sale

PSA 8 · 1st Ed

$21.00

last $21.00 · Aug 24, 2026 · 1 sale

CGC 9 · 1st Ed

$14.00

last $14.00 · Sep 7, 2026 · 1 sale

CGC 8.5 · 1st Ed

$10.00

last $10.00 · Aug 10, 2026 · 1 sale

Unconfirmed

CGC 8.5 · 3 bids · Sep 21, 2026

$7.00

Unconfirmed

CGC 8.5 · 3 bids · Sep 21, 2026

$7.00

Unconfirmed

CGC 9 · 7 bids · Sep 7, 2026

$14.00

Unconfirmed

CGC 10 · 10 bids · Sep 7, 2026

$39.00

Unconfirmed

CGC 5 · 2 bids · Aug 31, 2026

$6.00

Unconfirmed

PSA 8 · 5 bids · Aug 24, 2026

$21.00

Unconfirmed

CGC 8.5 · 4 bids · Aug 10, 2026

$10.00

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Attacks

20Bind

Flip a coin. If heads, the Defending Pokémon is now Paralyzed.

Tunneling

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.

How much is Brock's Onix #21/132 worth?

As of November 7, 2026, Brock's Onix #21/132 from Gym Heroes sells for around $11.65 in raw, ungraded condition. Across the 2 printings we track, copies run anywhere from $7.00 to $210.01 depending on the version you're holding.

Grading changes the math on this one: a PSA 10 is valued around $238.45, roughly 20.5x the raw price, while a PSA 9 sits near $22.50. 294 copies have been graded to date, and 18% of them came back a 10 — worth knowing before you pay grading fees.

These figures come from nightly market-data syncs verified against completed sales. Use the chart above to see the trend before you buy or sell.

Collecting Gym Heroes?Full master set guide — every card, chase list, and completion cost→