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Brock's Onix #21 Pokémon card from Gym Heroes

Brock's Onix 21/132

Gym Heroes

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Brock's Onix #21 from Gym Heroes currently trades at $10.99 raw, with PSA 10 copies reaching $238.45: a 21.7x grade premium. The card has moved up 37.4% over the past 30 days and up 35.8% over 90 days, suggesting sustained buying interest.
Current Prices (USD)
Ungraded
$10.99
PSA 7
$10.22
PSA 8
$11.00
PSA 9
$22.94
PSA 10
$238.45
ACE 10
—
BGS 10 Black
$1,550.00
CGC 10 Pristine
$23.00
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Raw Price Trend
7d
+26.9%
30d
+37.4%
90d
+35.8%
180d
+57.2%
1y
+55.9%
2y
+74.4%
5y
+212.2%

Quick price facts

Brock's Onix 21/132 from Gym Heroes has a current raw market value of $10.99.

Current raw value
$10.99
PSA 9 value
$22.94
PSA 10 value
$238
Raw value 7d
+26.9%
Raw value 30d
+37.4%
PSA 10 premium vs raw
21.7× raw
View all cards from Gym Heroes →
Collector Intel
21.7x
Raw → PSA 10
High-risk grade
2.1x
Raw → PSA 9
Grade multiplier
+37.4%
30d Price Move
Rising
Volatile
Price Stability
26.9% 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 22x the raw price. The expected value accounts for the realistic probability.
$11
Raw Price
$238
PSA 10 Value
+$227
Gross Premium (PSA 10)
before PSA fees
Grade Multiples vs Raw
PSA 9$232.1x raw
PSA 10$23821.7x raw

Frequently asked questions

How much is Brock's Onix #21 from Gym Heroes worth?+
Brock's Onix #21 from Gym Heroes currently reads Raw: $10.99, PSA 9: $22.94, PSA 10: $238 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 #21 worth grading?+
The PSA 10 price of $238 is 21.7× the raw price of $10.99. Grading fees vary by card value and PSA service tier — see PSA's current fee page before submitting.
Where do PokePrices Brock's Onix #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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  • 30 Oct 2026Raw
    ebaycompleted-auctions-usedplayed
    $11.13
  • 30 Oct 2026Raw
    ebaycompleted-auctions-usedunknown
    $14.63
  • 30 Oct 2026Raw
    ebaycompleted-auctions-usednear mint
    $11.99
  • 29 Oct 2026Raw
    ebaycompleted-auctions-usednear mint
    $11.33
  • 28 Oct 2026Raw
    tcgplayercompleted-auctions-usednear mint
    $11.00