Professor Oak's New Theory

HeartGold SoulSilver · #101/123 · Uncommon

$0.92

Market price ▲ 19.5% (1Y)

Printings & price history

Normal$0.92 Reverse Holofoil$6.92

Reverse Holofoil▲ 0.0% 7d$6.92

Low $4.00Mid $6.42High $63.10

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Graded values

updated 2026-07-08

Ungraded price history$6.92

Ungraded chart is building — graded values are tracked nightly, a new point appears each day.

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

As of July 8, 2026, Professor Oak's New Theory #101/123 from HeartGold SoulSilver sells for around $0.92 in raw, ungraded condition. Across the 2 printings we track, copies run anywhere from $0.25 to $63.10 depending on the version you're holding.

We update this valuation every night from live market data and verify it against real completed sales — see the chart above for how Professor Oak's New Theory has moved over time.