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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 $18.08 raw, with PSA 10 copies reaching $405.00 — a 22.4x grade premium. The card has gained 9.4% over the past 30 days.
Current Prices (USD)
Ungraded
$18.08
PSA 7
$23.97
PSA 8
$27.31
PSA 9
$57.50
PSA 10
$405.00
ACE 10
—
BGS 10 Black
$2,635.00
CGC 10 Pristine
$106.00
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Raw Price Trend
7d
+6.4%
30d
+9.4%
90d
—
180d
+5.9%
1y
+80.8%
2y
+84.9%
5y
+133.3%

Quick price facts

Brock's Onix [1st Edition] 21/132 from Gym Heroes has a current raw market value of $18.08.

Current raw value
$18.08
PSA 9 value
$57.50
PSA 10 value
$405
Raw value 7d
+6.4%
Raw value 30d
+9.4%
PSA 10 premium vs raw
22.4× raw
View all cards from Gym Heroes →
Collector Intel
22.4x
Raw → PSA 10
High-risk grade
3.2x
Raw → PSA 9
Grade multiplier
+9.4%
30d Price Move
Rising
Moderate
Price Stability
6.4% swing this week

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

Grading Calculator

Based on PSA Standard tier (~$25 USD). Assumes a perfect PSA 10 result — actual outcome depends on card condition.

⚠️ High-variance grade. PSA 10 is 22x the raw price. The expected value accounts for the realistic probability.
$18
Buy Raw
~$25
Grading Fee
PSA Standard
$405
PSA 10 Value
+$362
Best Case (PSA 10)
if you pull a 10
Grade Multiples vs Raw
PSA 9$583.2x raw
PSA 10$40522.4x 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 is currently worth Raw: $18.08, PSA 9: $57.50, PSA 10: $405 based on recent sold listings. Prices update daily from real eBay sales.
Is Brock's Onix [1st Edition] #21 worth grading?+
The PSA 10 price of $405 is 22.4× the raw price of $18.08. After a ~$25 grading fee, a PSA 10 result would net approximately $387 — assuming the card grades a 10.
Where do PokePrices Brock's Onix [1st Edition] #21 prices come from?+
Prices are tracked nightly from real sold listings on PriceCharting (raw, PSA 9 and PSA 10). PSA population data is sourced from PSA's public reports. We do not use asking prices — only confirmed sales.

Recent verified sales

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  • 14 Sep 2026Raw
    tcgplayercompleted-auctions-usednear mint
    $21.40
  • 11 Sep 2026Raw
    tcgplayercompleted-auctions-usednear mint
    $21.40
  • 7 Sep 2026Raw
    ebaycompleted-auctions-usedunknown
    $24.95
  • 5 Sep 2026Raw
    ebaycompleted-auctions-usednear mint
    $19.99
  • 5 Sep 2026Raw
    ebaycompleted-auctions-usedlightly played
    $15.50