MidpointCard Centering Grading Portfolio App
Brock's Onix (Gym Heroes 21/132) — is it worth grading?

Is Brock's Onix worth grading?

Pokémon · Gym Heroes · 21/132 · full price guide →

Worth grading — even a PSA 9 beats raw

A PSA 10 Brock's Onix sells for $526 against $16.94 raw: a $509 spread, 31× the ungraded price. Even a PSA 9 ($66.96) clears the raw price after an economy-tier ~$25 fee, so a near-miss still comes out ahead. Centering is the usual reason a clean copy misses the 10 — measure it before you submit.

Raw (NM)
$16.94
PSA 10
$526
PSA 9
$66.96
Gem premium
31×
As of
Oct 4, 2026

Break-even by outcome and fee

Brock's Onix: net result of grading versus selling raw, by outcome and fee tier
If it comes back…Sells forEconomy / bulk (~$25.00)Standard (~$50.00)Express (~$150)
Gem — PSA 10$526+$484+$459+$359
PSA 9$66.96+$25.02+$0.02−$99.98
PSA 8$34.39−$7.55−$32.55−$133

Net = sale price − $16.94 raw value − fee. Fee tiers are illustrative; plug your grader's current price into the calculator below.

Expected value — how often does it need to gem?

Brock's Onix: expected value of submitting by gem probability
Chance it gemsExpected saleExpected net (standard fee)
25%$182+$115
50%$296+$229
75%$411+$344

Even a miss (a 9) beats selling raw after the standard fee — the gem rate only decides how much you win by.

Which grader pays the most — and what a 10 takes

All centering standards →
Brock's Onix: top-grade value by grading company with centering tolerance
Grader10 sells forvs bestFront centering for a 10Back
PSA 10$526best55/4575/25
CGC 10$68.02−$45755/4575/25

Tolerances are each company's published centering standard for its top grade; surface, corners and edges must also be clean. Centering is the one you can measure yourself before you pay.

Brock's Onix graded prices by company and grade
GradePSACGCBGSSGC
10$125$13.00——
9.5—$29.00——
9$18.00$11.34$15.00$33.77
8.5—$10.00——
8$10.59———
7$13.00$18.00——
5$8.18———

Swipe the table for the other grading companies →

Run your own numbers

Should I pay this?

Enter the seller’s asking price to see your net outcome per grade.

Other Gym Heroes cards worth checking

Full set checklist →

Grading Brock's Onix — FAQ

Is Brock's Onix worth grading?

A PSA 10 Brock's Onix sells for $526 against $16.94 raw: a $509 spread, 31× the ungraded price. Even a PSA 9 ($66.96) clears the raw price after an economy-tier ~$25 fee, so a near-miss still comes out ahead. Centering is the usual reason a clean copy misses the 10 — measure it before you submit.

How much is a PSA 10 Brock's Onix worth compared with raw?

A PSA 10 Brock's Onix (Gym Heroes 21/132) sells for about $526 versus $16.94 for a raw near-mint copy — a 31× premium as of Oct 4, 2026.

Which grading company is best for Brock's Onix?

By resale value, PSA 10 leads at $526, ahead of CGC 10 at $68.02. Fees and turnaround differ, so the best-paying label is not always the best net.

What centering does Brock's Onix need for a PSA 10?

PSA publishes 55/45 front and 75/25 back centering as the tolerance for a 10 (Gem Mint). Off-center copies are capped below the top grade regardless of surface — measure yours before paying the fee.

Best on iPhone & Android

Check your Pokémon card in the Midpoint app

Scan with your camera to measure centering to the millimeter, get an AI grade with corner and edge close-ups, see what your copy is worth, and track it in your portfolio. Free to start.

Download on the App StoreGet it on Google Play

Or try it on the web →

Best on iPhone & Android

The full Midpoint experience is in the app

Scan with your camera, get AI grades with corner and edge close-ups, issue Grade Certificates, set price alerts, track your portfolio and talk to other collectors — everything here, plus the parts a browser can't do. Free to start.

Download on the App StoreGet it on Google Play