Professor Oak's New Theory
HeartGold & SoulSilver · #101/123 · Uncommon · 2010
Printings & price history
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Graded values
Grades 1–6 are estimates modeled from the raw price — PSA/CGC/BGS 7–10 and Ungraded are live tracked market values.
Ungraded chart is building — graded values are tracked nightly, a new point appears each day.
Graded population census · updated 2026-09-17
Reverse HolofoilPopulation data from PriceCharting, updated monthly.
How much is Professor Oak's New Theory #101/123 worth?
Professor Oak's New Theory #101/123 is a Uncommon card from HeartGold & SoulSilver (2010) — today it trades at roughly $0.71 ungraded. Across the 2 printings we track, copies run anywhere from $0.25 to $62.78 depending on the version you're holding.
Grading changes the math on this one: a PSA 10 is valued around $46.13, roughly 65.0x the raw price, while a PSA 9 sits near $39.00. 18 copies have been graded to date, and 11% of them came back a 10 — worth knowing before you pay grading fees.
These figures come from nightly market-data syncs verified against completed sales. Use the chart above to see the trend before you buy or sell.
