Rarity: Rare
HP: 70
Stage: Stage 1
Type: Water
Weakness: ×2
Artist: Hisao Nakamura
Attacks: Long Tentacle
Flip a coin. If heads, the Defending Pokémon is now Confused. If tails, discard an Energy card attached to the Defending Pokémon.
Toxic
The Defending Pokémon is now Poisoned. Put 2 damage counters instead of 1 on the Defending Pokémon between turns.

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Tentacruel #021

Undone Seal · Rare

Tentacruel #021 has a TCGplayer market price of $7.00 (Lightly Played, 1st Edition). Cardmarket lists it at €4.50 (Excellent, 1st Edition).

Market prices

Updated Oct 19, 2026

Lightly Played$7.00

Updated Oct 20, 2026

Excellent€4.50

Good€4.49

Played€1.99

Poor€1.00

These open on eBay through affiliate links. If you buy, we earn a commission.

Date	Price	Grader	Grade	Link
Sep 19, 2026	$15.00	—	—	View
Aug 30, 2026	$5.69	—	—	View
Aug 17, 2026	$2.25	—	—	View
Aug 16, 2026	$3.48	—	—	View
May 14, 2026	$18.00	—	—	View
Mar 15, 2026	$2.14	—	—	View
Sep 5, 2025	$2.67	—	—	View
May 3, 2025	$1.88	—	—	View
Apr 22, 2025	$4.00	—	—	View
Feb 9, 2025	$3.25	CGC	9.5	View
Feb 9, 2025	$4.99	CGC	9	View
Feb 24, 2024	$20.50	PSA	10	View
Jan 8, 2023	$3.64	—	—	View

The top of Undone Seal by market price today.