Professor Oak's New TheoryHeartGold & SoulSilver 101/123 price & value
Ungraded · near mint
Strong data$0.75
- PSA 10
- $54.79
- PSA 9
- $25.00
Prices updated today · How we price cards
Ungraded price by printing
- Non-holo$0.75
- Reverse holo$6.96
Current marketplace price for each printing. The headline value above blends sold prices across printings.
About this card
As of Sep 28, 2026, Professor Oak's New Theory 101/123 from HeartGold & SoulSilver is worth about $0.75 ungraded in near-mint condition and $54.79 graded PSA 10. That value is based on 7 recorded sales in the last 90 days.
Professor Oak's New Theory is card 101 of 123 in the HeartGold & SoulSilver price guide, a set released in February 2010 during the HeartGold & SoulSilver era. Its rarity is Uncommon. The artwork is by Ken Sugimori. In the checklist it sits after Professor Elm's Training Method 100/123 and before Switch 102/123.
It is the 104th most valuable of the 124 priced cards in HeartGold & SoulSilver, behind Lugia LEGEND 114/123 (see the most valuable HeartGold & SoulSilver cards). A PSA 10 copy is valued at about 73× the ungraded price, and a PSA 9 at $25.00, so condition matters a lot for this card.
Price history
- Now
- $0.75
- 4 weeks
- −11%
- 90 days
- −40%
- 1 year
- −60%
- Highest
- $7.99
- Lowest
- $0.74
Recorded history starts January 2021. Earlier history is monthly averages; from July 22, 2026 the line is a 7-day average of daily prices, so single-day swings don’t show.
Matched sold listings
Recent sales
15 on record
- CGC 102011 Pokemon HeartGold & SoulSilver Professor Oak's New Theory #101 CGC 10 GEM MSep 23, 2026 · Fanatics Collect · View listing$100
RawProfessor Oak's New Theory HeartGold SoulSilver 101/123 LP PokemonSep 17, 2026 · eBay · Listed as lightly played · View listing$2.19
RawProfessor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon LPSep 6, 2026 · eBay · Listed as lightly played · View listing$2.49
RawProfessor Oak's New Theory 101/123 Pokemon Uncommon HeartGold SoulSilver Card LPAug 11, 2026 · eBay · Listed as lightly played · View listing$0.89
RawPokemon Professor Oak's New Theory HeartGold & SoulSilver 101/123 NMJul 30, 2026 · eBay · Listed as near mint · View listing$2.00
RawPROFESSOR OAK'S NEW THEORY 101/123 HEARTGOLD & SOULSILVER Uncommon PokemonJul 20, 2026 · eBay · View listing$2.79
RawPokemon Karte Heartgold Soulsilver Nr. 101/123 Professor Oak's New Theory engl.Jul 14, 2026 · eBay · View listing$1.14- CGC 0.52010 Pokemon World Championships Decks LuxChomp Spirit Professor Oak's New TheorMay 13, 2026 · Fanatics Collect · View listing$5.00
Card details
- Number
- 101/123
- Rarity
- Uncommon
- Released
- Feb 10, 2010
- Illustrator
- Ken Sugimori
- Printings
- Non-holo, Reverse holo
Next in the binder
Nearby in HeartGold & SoulSilver
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$1.91Professor Elm's Training Method
HeartGold & SoulSilver · 100/123
$0.31Switch
HeartGold & SoulSilver · 102/123
$1.45Double Colorless Energy
HeartGold & SoulSilver · 103/123
$4.96Rainbow Energy
HeartGold & SoulSilver · 104/123
$1.96Ampharos
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$61.30
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Chase cards from this set
Common questions
How much is Professor Oak's New Theory 101/123 HeartGold & SoulSilver worth?
As of Sep 28, 2026, Professor Oak's New Theory 101/123 HeartGold & SoulSilver is worth about $0.75 ungraded in near-mint condition. Recent prices range from $0.75 to $0.75. A PSA 10 copy is worth about $54.79. How we price cards.
How much is a PSA 10 Professor Oak's New Theory 101/123 worth?
A PSA 10 Professor Oak's New Theory 101/123 HeartGold & SoulSilver is worth about $54.79; PSA 9 about $25.00; PSA 7 about $3.39. That is about 73× the ungraded value.
How often does Professor Oak's New Theory 101/123 sell?
Professor Oak's New Theory 101/123 HeartGold & SoulSilver recorded 7 sales in the last 90 days (3 in the last 30), most recently on Sep 23, 2026. The highest recent sale was $100 for a CGC 10 copy on Sep 23, 2026.
What is the most valuable card in HeartGold & SoulSilver?
The most valuable card in HeartGold & SoulSilver is Lugia LEGEND 114/123, at about $285 ungraded. Professor Oak's New Theory 101/123 ranks 104th of 124. See the full HeartGold & SoulSilver ranking.
What set is Professor Oak's New Theory 101/123 from?
Professor Oak's New Theory 101/123 is from the English Pokémon TCG set HeartGold & SoulSilver, released Feb 10, 2010, in the HeartGold & SoulSilver era. Its rarity is Uncommon.