Brock's Onix #21
📉 Dip AlertBrock's Onix is card #21 from Gym Heroes, a Rare Holo Pokémon card currently trading near $11.33 for its Unlimited printing.
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By CardLedger Research · Market data updated · Prices from TCGplayer & Cardmarket
Net estimates use each marketplace's default seller tier and typical shipping — fees vary by category, account status and payment method, so confirm current rates before selling.
Brock's Onix #21 has slipped week-on-week. Selling sooner limits downside, while buyers get a value window.
Brock's Onix at a glance
- Trades around $11.33 on TCGplayer.
- Trend price on Cardmarket: €8.64.
- Rare Holo rarity.
- From Gym Heroes (Gym), released 2000.
- Recent averages: €8.90 (7d), €9.52 (30d).
Brock's Onix price by printing
Live TCGplayer and Cardmarket values for Brock's Onix #21.
TCGplayer prices, updated 2026/10/26.
- Low
- $6.73
- Mid
- $9.13
- High
- —
Cardmarket pricing (EUR)
Cardmarket data updated 2026/10/26.
Verify the card image and live listings on TCGplayer, Cardmarket or eBay.
Is this Brock's Onix a good deal?
Put any asking price against today's live market value for Brock's Onix #21.
Enter what a seller is asking for Brock's Onix #21. We compare it to today's live market value.
About Brock's Onix #21
Printed as #21 in Gym Heroes, Brock's Onix belongs to the Gym series and dates to 2000. The card carries 70 HP and Fighting typing, with a Basic designation.
Artwork is by Benimaru Itoh; the Unlimited printing sits around $11.33, spanning $6.73–— between the cheapest and priciest listings.
Card facts
- Set
- Gym Heroes
- Series
- Gym
- Number
- #21 / 132
- Rarity
- Rare Holo
- Illustrator
- Benimaru Itoh
- HP
- 70
- Type
- Fighting
- Subtype
- Basic
- Released
- 2000/08/14
Brock's Onix attacks, abilities & battle stats
Printed card text and battle statistics for Brock's Onix #21 — the playability layer behind the price.
Bind
Flip a coin. If heads, the Defending Pokémon is now Paralyzed.
Tunneling
If your opponent has any Benched Pokémon, choose up to 2 of them. This attack does 20 damage to each of them. (Don't apply Weakness and Resistance for Benched Pokémon.) Brock's Onix can't attack during your next turn.
Battle stats
- Weakness
- Grass ×2
- Retreat cost
- —
- Attacks
- 2
Brock's Onix price analysis
What drives the current market value of Brock's Onix #21.
By print variant, TCGplayer lists Unlimited ($11.33) — 1 version in total.
$11.33 gives Brock's Onix real margin potential, so buy near the low end and sell toward the mid.
In the $11.33 band, condition and variant selection create meaningful price differences.
In EUR, Brock's Onix trends at €8.64 on Cardmarket (avg sold €9.84, lowest NM €1.85).
Brock's Onix price history & movement
The card is cooling off: the 7-day average sold price is €8.90, 6.5% below the 30-day average of €9.52.
Single-day average: €2.99; Cardmarket trend price €8.64.
Our own daily snapshots now cover 5 days for Brock's Onix, with a recorded low of $11.33 and high of $17.21; current value is at 0% of that band.
Recorded volatility runs near 14.8% per day, with a maximum drawdown of 34.2% over the tracked window.
Cardmarket averages
Price fingerprint
Built from CardLedger's own daily snapshots · 5 days tracked · latest
Real recorded values from our daily TCGplayer snapshots — not estimates or back-filled history. Methodology
How much would you net selling Brock's Onix?
Model the real take-home on a [object Object] sale across eBay, TCGplayer, Cardmarket and direct — fees and shipping included.
Selling Brock's Onix at $11.33 nets roughly $9.53 on eBay, $9.59 on TCGplayer, $10.41 via Cardmarket, $9.80 on Whatnot or $11.33 direct — the platform you pick is worth up to $1.80.
With this much value in the fee gap, platform choice materially changes your return. Model your exact shipping in the tool below.
Your sale
Pre-filled with the current TCGplayer market for Brock's Onix #21.
Modelled on each marketplace's default seller tier with your shipping input. Net payout = sale price − selling fees − outbound shipping. Fee figures are estimates (last reviewed October 15, 2026) and vary by category, account status and payment method — confirm current rates with the marketplace. Open the full seller fee calculator to model account tiers and buyer-paid shipping.
Should you grade Brock's Onix?
Model the break-even and PSA 9 vs PSA 10 profit on grading Brock's Onix #21 against today's raw market value.
Grading plan
Pre-filled with the live market value for Brock's Onix #21.
Both-way postage plus declared-value insurance.
Estimated graded values below are a transparent starting point based on the raw price band — edit them with real graded comps before deciding.
At $11.33 raw and $40.00 all-in grading cost, a PSA 10 nets — versus selling raw, a PSA 9 nets —. You need a graded sale of $57.31 to break even on grading.
At your stated grade odds the expected profit is — (-48.4% return on cost basis).
Grading costs, turnaround and grade outcomes vary by service and card. The estimated PSA 9 and PSA 10 values are heuristics, not predictions — always sanity-check against recent graded sold listings before committing. This is a modelling tool, not financial advice.
Brock's Onix within Gym Heroes
Brock's Onix ranks #34 of 53 tracked Gym Heroes cards by market value, against a set median of $14.26.
Relative to the set median it is a value pick, placing it in the top 38%.
The set's top card is Sabrina's Gengar (#14), valued at $515.81.
What makes Brock's Onix valuable
- Its Fighting typing means Brock's Onix has a dual collector-and-player audience.
- Artwork by Benimaru Itoh is a factor for collectors who follow specific illustrators.
- Its steady supply status keeps entry costs low, which supports steady turnover.
- Brock's Onix dates to 2000, and vintage-era supply cannot increase, which underpins long-term collector value.
- Rare Holo status puts Brock's Onix among the scarcer pulls in Gym Heroes.
Buying & selling Brock's Onix
- Gym Heroes was released in 2000; sealed product from this era is limited, so raw singles appreciate with collector demand.
- If you are buying to resell, model marketplace fees first — the $11.33 value is pre-fee, and the seller-fee calculator shows the net take-home per platform.
- Bulk lots of Brock's Onix can hide condition issues; inspect edges and holo surfaces before paying near the — high.
- Because it is a Pokémon card, Brock's Onix has both collector and player demand — a broader buyer pool than purely collectible cards.
- Centring and surface condition matter most on Rare Holo cards; a clean copy of Brock's Onix can realise well above the $6.73 low end.
Brock's Onix value questions
How much is Brock's Onix worth?
The current TCGplayer market value is $11.33 for the Unlimited printing, with a low of $6.73 and a high of —. Cardmarket trends at €8.64.
Will Brock's Onix hold its value?
As a vintage-era Rare Holo card it is trending down in the short term (-6.5% on the 7-day vs 30-day average). Finite supply supports long-term value.
What rarity is Brock's Onix?
Brock's Onix is a Rare Holo card from Gym Heroes (Gym series, 2000). That is an upper rarity tier, so demand concentrates on relatively few copies.
Which versions of Brock's Onix are there?
TCGplayer tracks 1 printing: Unlimited ($11.33). Prices differ between variants, so always confirm which one you own or are buying.
Where is Brock's Onix sold?
The main marketplaces are TCGplayer (USD), Cardmarket (EUR) and eBay. Current TCGplayer market is $11.33. When selling, compare net proceeds after fees — eBay and TCGplayer typically charge 9–13%, while direct sales carry lower or no fees.
What affects the price of Brock's Onix?
Four factors dominate: the Rare Holo rarity tier, the vintage-era Gym set pedigree, playability (Pokémon, Fighting), and condition. Artwork by Benimaru Itoh also matters to collector demand.
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