Grade Matrix
Graded
PSA 6
$10
Grade 7 guide
$9
Grade 8 guide
$11
Grade 9 guide
$24
PSA 10
$238
PSA 10: 1 sale, last 45 days · Sep 26, 2026 · checked Oct 25, 2026
Grade 9: No recent PSA 9 sales. PriceCharting Grade 9 guide, mixing PSA, CGC, BGS, SGC and TAG 9s.
Grade 7 and Grade 8 are PriceCharting guides across all graders (PSA, CGC, BGS, SGC, TAG).
CGC
CGC 8
-
CGC 9
-
CGC 10
$13
CGC P10
-
Availability
Availabilityi
1/10G: —
Graded: insufficient data · Sales per year: ~101 sales/yr · Recent sales: 2 PSA 10 comps · Raw recent sales: 60 · Grade 9 recent sales: 23 · PSA 10 recent sales: 13 · 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 $8.66 market price (PriceCharting raw (eBay sold fallback)). Its Delta multiple is 27.5x.
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 $238, the only PSA 10 sale in the last 45 days (Sep 26, 2026).
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 27.5x Delta. That describes the grading profile; it is not financial advice.
PSA 10 Recent sales
| Date | Listing | Sale |
|---|---|---|
| Sep 26, 2026 | PSA 10 Brock's Onix Gym Heroes 21/132 Unlimited Pokemon Card GEM MINT POP 22 | $238.45 |
| Jul 4, 2026 | 2000 Pokemon Gym Heroes #21 Brock’s Onix PSA 10 21/132 | $388.83 |