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Brock's Onix [1st Edition] #21 Pokémon card from Gym Heroes

Brock's Onix [1st Edition] 21/132

Gym Heroes

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Brock's Onix [1st Edition] #21 from Gym Heroes currently trades at $19.08 raw, with PSA 10 copies reaching $405.00: a 21.2x grade premium. Price is down 1.4% in the last 30 days, though the 90-day trend tells a different story at +31.6%. Worth watching for a clearer direction.
Current Prices (USD)
Ungraded
$19.08
PSA 7
$27.96
PSA 8
$30.05
PSA 9
$79.50
PSA 10
$405.00
ACE 10
—
BGS 10 Black
$2,635.00
CGC 10 Pristine
$352.00
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Raw Price Trend
7d
+9.1%
30d
-1.4%
90d
+31.6%
180d
+29.4%
1y
+78.0%
2y
+90.8%
5y
+138.8%

Quick price facts

Brock's Onix [1st Edition] 21/132 from Gym Heroes has a current raw market value of $19.08.

Current raw value
$19.08
PSA 9 value
$79.50
PSA 10 value
$405
Raw value 7d
+9.1%
Raw value 30d
-1.4%
PSA 10 premium vs raw
21.2× raw
View all cards from Gym Heroes →
Collector Intel
21.2x
Raw → PSA 10
High-risk grade
4.2x
Raw → PSA 9
Grade multiplier
-1.4%
30d Price Move
Falling
Moderate
Price Stability
9.1% swing this week

Calculated from price history, PSA population data, and market trends. Not financial advice.

Grading Calculator

Figures below are the gross raw-to-PSA-10 spread. PSA grading fees vary by card value and service tier — check psacard.com/services for the fee applicable to this card. Assumes a perfect PSA 10; actual outcome depends on card condition.

⚠️ High-variance grade. PSA 10 is 21x the raw price. The expected value accounts for the realistic probability.
$19
Raw Price
$405
PSA 10 Value
+$386
Gross Premium (PSA 10)
before PSA fees
Grade Multiples vs Raw
PSA 9$804.2x raw
PSA 10$40521.2x raw

Frequently asked questions

How much is Brock's Onix [1st Edition] #21 from Gym Heroes worth?+
Brock's Onix [1st Edition] #21 from Gym Heroes currently reads Raw: $19.08, PSA 9: $79.50, PSA 10: $405 in our aggregated recent-sales price guide. The guide is rebuilt nightly from sold-sales data across the major Pokémon TCG marketplaces, never asking prices.
Is Brock's Onix [1st Edition] #21 worth grading?+
The PSA 10 price of $405 is 21.2× the raw price of $19.08. Grading fees vary by card value and PSA service tier — see PSA's current fee page before submitting.
Where do PokePrices Brock's Onix [1st Edition] #21 prices come from?+
Raw, PSA 9 and PSA 10 figures come from our aggregated recent-sales price guide, rebuilt nightly from sold-sales data across the major Pokémon TCG marketplaces. The displayed values are guide numbers, not individual listings. PSA population data is sourced directly from PSA's public population reports. Asking prices are never used; only confirmed sales activity feeds the guide.

Recent tracked sales

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  • 27 Oct 2026Raw
    ebaycompleted-auctions-usedunknown
    $15.00
  • 26 Oct 2026Raw
    tcgplayercompleted-auctions-usednear mint
    $19.99
  • 19 Oct 2026Graded
    ebaycompleted-auctions-cibunknown
    $29.99
  • 17 Oct 2026Raw
    ebaycompleted-auctions-usedunknown
    $22.00
  • 16 Oct 2026Raw
    ebaycompleted-auctions-usednear mint
    $19.99