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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 $10.25 raw, with PSA 10 copies reaching $183.89 — a 17.9x grade premium. The card has gained 18.4% over the past 30 days.
Current Prices (USD)
Ungraded
$10.25
PSA 7
$9.00
PSA 8
$11.27
PSA 9
$22.10
PSA 10
$183.89
ACE 10
—
BGS 10 Black
$1,195.00
CGC 10 Pristine
$23.00
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Raw Price Trend
7d
+8.5%
30d
+18.4%
90d
—
180d
+22.6%
1y
+71.1%
2y
+79.2%
5y
+720.0%

Quick price facts

Brock's Onix 21/132 from Gym Heroes has a current raw market value of $10.25.

Current raw value
$10.25
PSA 9 value
$22.10
PSA 10 value
$184
Raw value 7d
+8.5%
Raw value 30d
+18.4%
PSA 10 premium vs raw
17.9× raw
View all cards from Gym Heroes →
Collector Intel
17.9x
Raw → PSA 10
High-risk grade
2.2x
Raw → PSA 9
Grade multiplier
+18.4%
30d Price Move
Rising
Moderate
Price Stability
8.5% 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 18x the raw price. The expected value accounts for the realistic probability.
$10
Buy Raw
~$25
Grading Fee
PSA Standard
$184
PSA 10 Value
+$149
Best Case (PSA 10)
if you pull a 10
Grade Multiples vs Raw
PSA 9$222.2x raw
PSA 10$18417.9x raw

Frequently asked questions

How much is Brock's Onix #21 from Gym Heroes worth?+
Brock's Onix #21 from Gym Heroes is currently worth Raw: $10.25, PSA 9: $22.10, PSA 10: $184 based on recent sold listings. Prices update daily from real eBay sales.
Is Brock's Onix #21 worth grading?+
The PSA 10 price of $184 is 17.9× the raw price of $10.25. After a ~$25 grading fee, a PSA 10 result would net approximately $174 — assuming the card grades a 10.
Where do PokePrices Brock's Onix #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

Find this card on eBay →Affiliate · we may earn commission
  • 14 Sep 2026Raw
    ebaycompleted-auctions-usedunknown
    $12.50
  • 11 Sep 2026Raw
    tcgplayercompleted-auctions-usednear mint
    $21.40
  • 10 Sep 2026Raw
    tcgplayercompleted-auctions-usednear mint
    $7.89
  • 8 Sep 2026Raw
    tcgplayercompleted-auctions-usednear mint
    $9.45
  • 7 Sep 2026Raw
    ebaycompleted-auctions-usedunknown
    $15.95