| Set | HeartGold & SoulSilver |
| Card number | 101 |
| Rarity | Uncommon |
| Type | Trainer |
| HP | 0 |
| Artist | Ken Sugimori |
| Released | Feb 2010 |
Professor Oak's New Theory #101 Value (HeartGold & SoulSilver)
Pokemon card price guide: raw and graded values, eBay sold prices and price history. Updated Nov 2, 2026.
Current prices
| Source | Price |
|---|---|
| TCGplayer market price (USD) | $5.95 |
| Cardmarket lowest near mint (EUR) | €0.20 |
| Cardmarket 7-day average (EUR) | €0.23 |
| Cardmarket 30-day average (EUR) | €0.24 |
| Cardmarket listings available | 744 |
Buy / compare: TCGplayer · eBay · eBay sold · Cardmarket
Have a copy in hand? Scan it with the Pokémon card scanner to confirm it is this exact printing.
Why Professor Oak's New Theory #101 is priced where it is
Professor Oak's New Theory #101 is an Uncommon Trainer card from HeartGold & SoulSilver, the HeartGold & SoulSilver era (2010). It ranks as number 89 by price out of 124 cards in the set. Its price has held almost flat over the last 30 days ($5.95 to $5.95). The illustration is by Ken Sugimori.
Professor Oak's New Theory price history
| Month | Avg Cardmarket low | Avg TCGplayer market |
|---|---|---|
| Nov 2026 | €0.20 | $5.95 |
| Oct 2026 | €0.20 | $5.95 |
| Sep 2026 | €0.20 | $5.93 |
| Aug 2026 | €0.20 | $4.49 |
| Jul 2026 | €0.20 | $0.76 |
| May 2026 | €0.07 | $0.76 |
| Apr 2026 | €0.05 | $0.76 |
| Mar 2026 | €0.14 | $0.73 |
| Feb 2026 | €0.14 | $0.73 |
Frequently asked questions
What is Professor Oak's New Theory #101 worth on Nov 2, 2026?
As of Nov 2, 2026, a raw near mint copy is worth about $5.95, the Cardmarket low is €0.20. Prices update hourly from Cardmarket, TCGplayer and eBay sold listings.
Is Professor Oak's New Theory #101 rare?
Professor Oak's New Theory #101 is printed at Uncommon rarity and ranks number 89 by price among the 124 cards in HeartGold & SoulSilver. Demand for the character and condition matter more than the rarity symbol.
Is Professor Oak's New Theory #101 going up in value?
Not much right now. Its price has stayed within a few percent over the last 30 days, at about $5.95.
How do I check which printing of Professor Oak's New Theory I have?
Look at the set symbol and the card number (101) at the bottom of the card, then match both to this page. A phone scanner such as Card Value Scanner on iPhone reads them from one photo; on Android, search the number in the price guide.
Most valuable cards in HeartGold & SoulSilver
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