Pokémon sets › HeartGold & SoulSilver › Professor Oak's New Theory

HeartGold & SoulSilver Professor Oak's New Theory Pokémon card

Professor Oak's New Theory #101

HeartGold & SoulSilver · 2010 · Uncommon

Ungraded · US

$0.97

PSA 10 · US

$45.47

Ungraded · UK

£0.80

PSA 10 · UK

£33.56

Low confidence 223rd most valuable of 237 priced cards in HeartGold & SoulSilver

Rough guide — limited market data — lower-demand card, low-value, bulk-traded.

Built from United States market data — recent sales of this card in that market, refreshed weekly.

A PSA 10 of this card sells for about 46.9× the ungraded price — $0.97 raw against $45.47 graded.

We began recording US prices as their own series in August 2026, so there are not yet enough readings to chart a US trend for this card. It will appear here as they accumulate.

US guide prices, with the UK market alongside — updated 30 August 2026. Each market is priced from real market data in that market. Estimates for collection tracking — not an appraisal or a quote.

Check recent US sold prices on eBay →

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