$6.99Professor Oak's New Theory 101/123 HeartGold SoulSilver price
Professor Oak's New Theory is card 101 of 123 in HeartGold SoulSilver (HS), released Feb 10, 2010. Its TCGplayer market price is $6.99 for the Reverse Holofoil finish as of Nov 7, 2026. On Cardmarket the holo trend price is €2.74.
UncommonHSEnglishNormalReverse Holo
Market prices by finish
| Source | Finish | Market | Low |
|---|---|---|---|
| Cardmarket | Holo | €2.74 | €0.40 |
| Cardmarket | Normal | €0.20 | €0.02 |
| TCGplayer | Normal | $0.71 | $0.25 |
| TCGplayer | Reverse Holofoil | $6.99 | $4.00 |
TCGplayer prices in US dollars (market = recent sales), Cardmarket in euros (market = trend price). Source data from Nov 7, 2026.
Price history
TCGplayer Normal, one point per price change.
