GemDelta
Dashboard

Grade Matrix

Graded
PSA 6
-
Grade 7 guide
$28
Grade 8 guide
$30
PSA 9
$98
PSA 10
$405

PSA 10: PriceCharting · last PSA 10 sale $650.00 on Aug 9, 2026 · checked Oct 25, 2026

PSA 9: Median of 2 PSA 9 sales in the last 90 days, latest 2026-10-11. Grade 9 guide (all graders): $80.

Grade 7 and Grade 8 are PriceCharting guides across all graders (PSA, CGC, BGS, SGC, TAG).

CGC
CGC 8
-
CGC 9
-
CGC 10
$269
CGC P10
-

Availability

Availabilityi
1/10G: 5/y
Graded: ~5 sales/yr (extremely low) · Sales per year: ~81 sales/yr · Recent sales: 1 PSA 10 comp · Raw recent sales: 53 · Grade 9 recent sales: 30 · PSA 10 recent sales: 21 · Graded copies: 307

TCGplayer Price History

1st EditionProduct 83974Fetched Oct 21, 3:31 AM
Weekly market
$17.21
week ending Oct 19
Weekly avg sale
$0.00
week ending Oct 19
Units sold (week)
0
week ending Oct 19

Card Value FAQ

How much is Brock's Onix (Gym Heroes #21) worth?

GemDelta shows Brock's Onix (Gym Heroes #21) at $17.36 market price (TCGplayer market). Its Delta multiple is 23.3x.

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 $405. GemDelta labels this as a PriceCharting guide fallback rather than verified recent sales.

Is Brock's Onix (Gym Heroes #21) worth grading?

GemDelta records a 17.3% gem rate for Brock's Onix (Gym Heroes #21), with 53 PSA 10 copies out of 307 total PSA grades and a 23.3x Delta. That describes the grading profile; it is not financial advice.

PSA 10 Recent sales

DateListingSale
Aug 9, 20262000 Pokemon Gym Heroes #21 Brock's Onix 1st Ed Psa 10 #21$650.00