What is Professor Oak’s New Theory from HeartGold SoulSilver worth?

Across every grade, Professor Oak’s New Theory (HeartGold SoulSilver #101) has a median sold price of $0.44 over the last 90 days, from 5 recorded sales ranging $0.25 to $1.10.

Where can I buy Professor Oak’s New Theory?

There are 20 copies listed right now across CardDojo and the marketplaces this page tracks, starting at $0.25. The listings panel above shows each one with its source and grade.

Printed finishes

NormalReverse holo

Card details

HP: 0
Illustrator: Ken Sugimori
Set: HeartGold SoulSilver (hgss1)
Card number: #101/123
Released: Feb 10, 2010

Professor Oak’s New Theory

HeartGold SoulSilver · #101/123

Pokémon🇺🇸 English

Market price

$0.44

0.0% · −$0.00 vs prior 90 days

Median of 5 copies sold in the last 90 days · ranged $0.25 to $1.10

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Last sold

$0.44

Sep 18, 2026, 4:13 AM on TCGplayer · avg $0.62 across 5 sales · -34.5% (−$0.38) in range on TCGplayer

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Recent sales

Frequently asked questions

What is Professor Oak’s New Theory from HeartGold SoulSilver worth?: Across every grade, Professor Oak’s New Theory (HeartGold SoulSilver #101) has a median sold price of $0.44 over the last 90 days, from 5 recorded sales ranging $0.25 to $1.10.
Where can I buy Professor Oak’s New Theory?: There are 20 copies listed right now across CardDojo and the marketplaces this page tracks, starting at $0.25. The listings panel above shows each one with its source and grade.

Median sold price and lowest current asking price for each grade of this card
Median sold	Sales	Lowest ask
$0.44	5	$0.25
$0.44	5	$0.25
—	0	$100.00
—	0	$35.00

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Card details

Professor Oak’s New Theory

Price history

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