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Prices sourced from TCGPlayer and CardMarket. Not affiliated with Nintendo, The Pokemon Company, or any card marketplace.

Home / Pokemon card prices / HeartGold SoulSilver / Professor Oak's New Theory

Professor Oak's New Theory

HeartGold SoulSilver

Set: HeartGold SoulSilverNumber: 101Updated 9/11/2026

Market price

$0.79

TCGPlayer

$0.79

eBay avg

$0.80

Variants

Variant

Price History

In the app

Price movement over time is available in the PokiFrame app.

eBay Sold Prices

1 sale

Raw1 sale · $2.04–$2.04

$0.80

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About Professor Oak's New Theory

Professor Oak's New Theory is card 101 from the HeartGold SoulSilver set. It is tracked in 2 print variants, each priced separately above.

The current TCGPlayer market price is $0.79.

PokiFrame aggregates this data from TCGPlayer, CardMarket, and eBay so you can confirm Professor Oak's New Theory's value before you buy, sell, or trade.

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Professor Oak's New Theory — common questions

How much is Professor Oak's New Theory worth?: Professor Oak's New Theory from HeartGold SoulSilver has a market price of $0.79 for an ungraded copy, based on current TCGPlayer and eBay sales data. Condition, print variant and grading all move that number.