What is the current resale value for this Ungraded Tentacool #20?

The current listing price for this Ungraded item is $3.

Is the "Undone Seal" designation important for its value?

Yes, the Japanese Undone Seal designation is part of the set information that contributes to its collectible value.

What game is this Pokémon card from?

This card is from the Pokémon game line.

Tentacool #20 — Pokémon Japanese Undone Seal Card Value

Name: Tentacool #20 — Pokémon Japanese Undone Seal Card Value
Brand: Pokémon

Pokémon Japanese Undone Seal

What the Tentacool #20 card from Pokémon Japanese Undone Seal is worth — ungraded and graded (PSA 10).

Tentacool #20 value — Ungraded $3. Prices updated July 2026.

Set · Pokémon Japanese Undone SealGame · Pokémon

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Which version do you have?

If you simply want Tentacool #20, buy the Standard version for $3. The 1st Edition costs $1, offering a slight premium for its collectible status, though the difference is minimal here. For the casual collector wanting the lowest entry point, the Standard is fine. However, if you value the historical significance of the first printing, the $1 1st Edition is the worthwhile purchase.

VersionUsedNewBuy

Standard— this pageTentacool #20 — Pokémon Japanese Undone Seal Card Value$2.66—eBay ↗

1st EditionTentacool [1st Edition] #20 — Pokémon Japanese Undone Seal Card Value$1.16$70eBay ↗

JunkPal AI· resale insightanalyzing sold comps…

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Price data verified against · 1

PriceCharting — Tentacool #20 (Pokémon Japanese Undone Seal)$2.66

Item details

Brand: Pokémon
Set: Pokémon Japanese Undone Seal
Game: Pokémon

Tentacool #20 (Pokémon Japanese Undone Seal) card value

An ungraded Tentacool #20 from Pokémon Japanese Undone Seal averages around $3. A Grade 9 copy runs about null, and a PSA 10 gem-mint commands null.

What drives the price

Centering, corners, edges, and surface decide a card's grade — and the grade decides the price. The jump from raw to PSA 10 can be 5–20×, so condition is everything. Holos, first editions, and shadowless prints carry the biggest premiums.

Price guide

What this actually trades for — sold values by condition vs. what sellers are asking today

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Condition	Value	Based on
Ungraded	$3	eBay sold comps

Frequently asked questions

What is the current resale value for this Ungraded Tentacool #20?: The current listing price for this Ungraded item is $3.
Is the "Undone Seal" designation important for its value?: Yes, the Japanese Undone Seal designation is part of the set information that contributes to its collectible value.
What game is this Pokémon card from?: This card is from the Pokémon game line.