Market researchAll setsBlogsMy Cards

Professor Oak's New Theory #101

HeartGold & SoulSilver
Release Date February 10, 2010Card Number #101
Ungraded
€0.89
 
Grade 9
€14.37
 
PSA 10
€40.69
 

Professor Oak's New Theory #101 price guide

Current sold value for every grade.
Ungraded€0.89
Grade 2€1.78
Grade 3€1.78
Grade 4€1.78
Grade 5€1.78
Grade 6€2.67
Grade 7€3.02
Grade 9€14.37
Grade 9.5€16.02
SGC 10€24.02
CGC 10€24.02
PSA 10€40.69
BGS 10€52.50
BGS 10 Black€262.49
CGC 10 Pristine€43.60

Recent sales

Individual completed sales, newest first (Ungraded).
12 Oct 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€1.01
24 Sept 2026Professor Oak's New Theory HeartGold SoulSilver 101/123 LP Pokemon 101/123eBay€1.95
12 Sept 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.74
8 Sept 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.42
2 Sept 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.71
28 Aug 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.53
26 Aug 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.42
24 Aug 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.62
14 Aug 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.71
13 Aug 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.44
12 Aug 2026Professor Oak's New Theory 101/123 Pokemon Uncommon HeartGold SoulSilver Card LPeBay€0.79
1 Aug 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.89
31 Jul 2026Pokemon Professor Oak's New Theory HeartGold & SoulSilver 101/123 NM 101/123eBay€1.78
28 Jul 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.80
27 Jul 2026PROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon - NM 109/132eBay€1.42
20 Jul 2026PROFESSOR OAK'S NEW THEORY 101/123 HEARTGOLD & SOULSILVER Uncommon Pokemon 101/123eBay€2.48
18 Jul 2026Professor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon NM 101/123eBay€1.77
16 Jul 2026Pokemon Card Heartgold Soulsilver No. 101/123 Professor Oak's New Theory EnglisheBay€1.02
11 Jul 2026Professor Oak's New Theory HeartGold SoulSilver 101/123 Pokemon Card 101/123eBay€1.77
10 Jul 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€1.75
6 Jul 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.58
2 Jul 2026Pokemon - Professor Oak's New Theory - 101/123 - Uncommon - HeartGold SoulSilver 101/123eBay€0.92
22 Jun 2026Professor Oak's New Theory #101 Near Mint EnglishTCGPlayer€0.71
20 Jun 2026Professor Oak's New Theory HeartGold SoulSilver Uncommon 101/123 2010 Pokemon TC 101/123eBay€2.66
20 Jun 2026PROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon - PL 109/132eBay€1.33

How much is Professor Oak's New Theory #101 (HeartGold & SoulSilver) worth?

Right now an ungraded copy of Professor Oak's New Theory #101 from HeartGold & SoulSilver sells for about €0.89, a PSA 9 for about €14.37 and a PSA 10 for about €40.69. These values are based on 27 recent completed sales, the latest on 12 Oct 2026. Prices are converted from US dollars to euros and updated every few hours.

More HeartGold & SoulSilver card prices

The most valuable cards in this set. See all HeartGold & SoulSilver prices →

Lugia Legend #114

HeartGold & SoulSilver
Ungraded€177.96PSA 10€4,049

Gyarados #123

HeartGold & SoulSilver
Ungraded€111.22PSA 10€7,474

Typhlosion Prime #110

HeartGold & SoulSilver
Ungraded€58.71PSA 10€937.75

Feraligatr #108

HeartGold & SoulSilver
Ungraded€80.41PSA 10€1,223

Ho-Oh Legend #111

HeartGold & SoulSilver
Ungraded€78.87PSA 10€4,983

Lugia Legend #113

HeartGold & SoulSilver
Ungraded€117.58PSA 10€5,300

Meganium #109

HeartGold & SoulSilver
Ungraded€46.11PSA 10€1,435

Ampharos #105

HeartGold & SoulSilver
Ungraded€44.28PSA 10€801.04

Blissey #106

HeartGold & SoulSilver
Ungraded€28.70PSA 10€1,591

Ho-Oh Legend #112

HeartGold & SoulSilver
Ungraded€55.79PSA 10€1,033

Pikachu #78

HeartGold & SoulSilver
Ungraded€8.90PSA 10€502.38

Donphan #107

HeartGold & SoulSilver
Ungraded€23.00PSA 10€4,148