HeartGold & SoulSilver

Professor Oak's New Theory 101/123

Set

101/123

Number

Uncommon

Rarity

Ken Sugimori

Artist

How much is Professor Oak's New Theory 101/123 worth?

The CardMarket price of Professor Oak's New Theory 101/123 is 0,21 €, with a price trend of 0,21 € and a lowest listing of 0,02 €, and the TCGPlayer market price is $6.66. Prices updated November 5, 2026. The CardMarket price trend moved -30.0% in 7 days and +50.0% in 30 days, between 0,14 € and 0,36 €.

Europe

CardMarket price

0,21 €

Trend 0,21 € · Lowest listing 0,02 € · Average sell price 0,21 €

United States

TCGPlayer market price

$6.66

Reverse Holo: 0,40 € · $0.45

Card details

Category: Trainer
Released: February 10, 2010

Names in other languages

Professor Eichs neue Theorie
German · HeartGold SoulSilver
Nouvelle théorie du Prof. Chen
French
Unknown
Spanish
Unknown
Italian

Price History

Since October 3, 2026, the CardMarket price trend has ranged from 0,02 € on October 3, 2026 to 0,36 € on October 25, 2026.

Market Price

CardMarket lowest listing
CardMarket trend
TCGPlayer market

Monthly prices
Month	CardMarket trend	TCGPlayer market
November 2026	0,21 €	$6.66
October 2026	0,30 €	$6.66
September 2026	—	$6.66
August 2026	—	$6.62
July 2026	—	$0.85
June 2026	—	$0.85
May 2026	—	$0.85
April 2026	—	$0.85
March 2026	—	$0.85
February 2026	—	$0.82
January 2026	—	$0.77
December 2025	—	$0.81

Other prints of Professor Oak's New Theory

Call of Legends

83/95•0,34 €

In Japanese

HeartGold Collection (Japanese)

068/70•0,92 €

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