Rarity: Rare
HP: 70
Stage: Basic
Type: Pokemon
Energy
Weakness
Retreat
Artist: Benimaru Itoh
Attacks: Bind
20
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.
Flavor: Rock Snake Pokémon. Length: 28'10", Weight: 463 lbs. LV. 30 #95

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Brock's Onix #021

Gym Heroes · Rare

Brock's Onix #021 has a TCGplayer market price of $17.21 (Near Mint, 1st Edition). Cardmarket lists it at €7.50 (Played, 1st Edition).

Market prices

Updated Oct 19, 2026

Near Mint$17.21

Lightly Played$10.66

Moderately Played$9.04

Heavily Played$6.35

Damaged$4.99

Updated Oct 19, 2026

Played€7.50

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Date	Price	Grader	Grade	Link
Sep 29, 2026	$7.19	—	—	View
Sep 26, 2026	$8.46	—	—	View
Sep 20, 2026	$11.99	—	—	View
Sep 19, 2026	$2.75	—	—	View
Sep 15, 2026	$16.46	—	—	View
Sep 7, 2026	$15.95	—	—	View
Sep 7, 2026	$24.95	—	—	View
Sep 5, 2026	$15.50	—	—	View
Sep 2, 2026	$12.99	—	—	View
Sep 1, 2026	$10.99	—	—	View
Aug 31, 2026	$20.24	—	—	View
Aug 31, 2026	$5.37	—	—	View
Aug 30, 2026	$12.99	—	—	View
Aug 30, 2026	$18.70	—	—	View
Aug 29, 2026	$8.99	—	—	View
Aug 29, 2026	$20.00	—	—	View
Aug 28, 2026	$15.84	—	—	View
Aug 24, 2026	$29.00	CGC	9.5	View
Aug 24, 2026	$8.50	—	—	View
Aug 16, 2026	$13.99	—	—	View

The top of Gym Heroes by market price today.