Grade Matrix
PSA
PSA 6
-
PSA 7
$9
PSA 8
$11
PSA 9
$22
PSA 10
$122
PSA 10: PriceCharting; refreshed Sep 10, 2026
CGC
CGC 8
-
CGC 9
-
CGC 10
$13
CGC P10
-
Availability
Availabilityi
1/10G: —
Graded: insufficient data · Sales per year: ~101 sales/yr · Graded copies: 126
TCGplayer Price History
NormalProduct 83974
No Normal price series for this product. Available: 1st Edition, Unlimited.
Card Value FAQ
How much is Brock's Onix (Gym Heroes #21) worth?
GemDelta shows Brock's Onix (Gym Heroes #21) at $8.19 market price (PriceCharting raw (eBay sold fallback)). Its Delta multiple is 14.8x.
How much is a PSA 10 Brock's Onix (Gym Heroes #21) worth?
A PSA 10 Brock's Onix (Gym Heroes #21) is currently shown at $122. GemDelta labels this as an unverified PriceCharting guide fallback rather than verified recent sales.
Is Brock's Onix (Gym Heroes #21) worth grading?
GemDelta records a 17.5% gem rate for Brock's Onix (Gym Heroes #21), with 22 PSA 10 copies out of 126 total PSA grades and a 14.8x Delta. That describes the grading profile; it is not financial advice.