Professor Oak's New Theory
HeartGold SoulSilvern° 101/123Uncommon
Normal$0.76from $0.25
Reverse$6.99from $4.00
TCGplayer market price, updated 2 November 2026.
Add it to my collection ▶Free, no account needed to start.
Other Professor Oak's New Theory cards
Call of Legends$1.15FAQ
How much is Professor Oak's New Theory 101/123 (HeartGold SoulSilver) worth?
As of 2 November 2026, Professor Oak's New Theory 101/123 is worth $0.76 (TCGplayer market price, from $0.25).
What is the reverse Professor Oak's New Theory worth?
The reverse Professor Oak's New Theory 101/123 is worth $6.99 as of 2 November 2026.
Which set is Professor Oak's New Theory 101/123 from?
HeartGold SoulSilver (HS), released 10 February 2010, Uncommon.