Professor Oak's New Theory
- Number
- 101/123
- Rarity
- Uncommon
- Artist
- Ken Sugimori
- Released
- Feb 10, 2010
Sold price movement
Where the price has been
- 12 months ago
- $3.04£2.29€2.68
- Today
- $4.43£3.33€3.90
- Change
- +$1.39+£1.05+€1.22 (+45.7%)
Raw market value · Reverse Holofoil
$6.96.
NM raw · TCGplayer marketMarket activity
7 day – · 30 day +0.6%
Price by printingLeague Promo$32.50
| Price type | Pop share | PopulationPop | Sold 90d | Median | Price |
|---|---|---|---|---|---|
| Raw | – | – | – | $4.43£3.33€3.90 | |
| PSA 8 | 2 | – | – | – | |
| PSA 9 | 1 | – | – | – | |
Priced from 52 completed sales, updated Sep 13, 2026.
Recent sales
52 completed listingsWhereSort
SoldGradeListingPrice
Aug 12, 2026RawProfessor Oak's New Theory 101/123 Pokemon Uncommon HeartGold SoulSilver Card LP$0.89£0.67€0.78
Professor Oak's New Theory 101/123 Pokemon Uncommon HeartGold SoulSilver Card LP$0.89£0.67€0.78Jul 31, 2026RawPokemon Professor Oak's New Theory HeartGold & SoulSilver 101/123 NM 101/123$2£1.51€1.76
Pokemon Professor Oak's New Theory HeartGold & SoulSilver 101/123 NM 101/123$2£1.51€1.76Jul 27, 2026RawPROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon - NM 109/132$1.60£1.20€1.41
PROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon - NM 109/132$1.60£1.20€1.41Jul 20, 2026RawPROFESSOR OAK'S NEW THEORY 101/123 HEARTGOLD & SOULSILVER Uncommon Pokemon 101/123$2.79£2.10€2.46
PROFESSOR OAK'S NEW THEORY 101/123 HEARTGOLD & SOULSILVER Uncommon Pokemon 101/123$2.79£2.10€2.46Jul 18, 2026RawProfessor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon NM 101/123$1.99£1.50€1.75
Professor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon NM 101/123$1.99£1.50€1.75Jul 16, 2026RawPokemon Card Heartgold Soulsilver No. 101/123 Professor Oak's New Theory English$1.15£0.87€1.01
Pokemon Card Heartgold Soulsilver No. 101/123 Professor Oak's New Theory English$1.15£0.87€1.01Show 40 more
Jul 11, 2026RawProfessor Oak's New Theory HeartGold SoulSilver 101/123 Pokemon Card 101/123$1.99£1.50€1.75
Professor Oak's New Theory HeartGold SoulSilver 101/123 Pokemon Card 101/123$1.99£1.50€1.75Jul 2, 2026RawPokemon - Professor Oak's New Theory - 101/123 - Uncommon - HeartGold SoulSilver 101/123$1.03£0.78€0.91
Pokemon - Professor Oak's New Theory - 101/123 - Uncommon - HeartGold SoulSilver 101/123$1.03£0.78€0.91Jun 20, 2026RawProfessor Oak's New Theory HeartGold SoulSilver Uncommon 101/123 2010 Pokemon TC 101/123$2.99£2.25€2.63
Professor Oak's New Theory HeartGold SoulSilver Uncommon 101/123 2010 Pokemon TC 101/123$2.99£2.25€2.63Jun 20, 2026RawPROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon - PL 109/132$1.50£1.13€1.32
PROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon - PL 109/132$1.50£1.13€1.32Jun 17, 2026RawPokemon Professor Oak’s New Theory 101/123 Heartgold & Soulsilver MP+ 101/123$1.90£1.43€1.67
Pokemon Professor Oak’s New Theory 101/123 Heartgold & Soulsilver MP+ 101/123$1.90£1.43€1.67Jun 17, 2026RawPokemon Card HeartGold & SoulSilver Professor Oak's New Theory 101/123 Uncommon 101/123$1.49£1.12€1.31
Pokemon Card HeartGold & SoulSilver Professor Oak's New Theory 101/123 Uncommon 101/123$1.49£1.12€1.31Jun 17, 2026RawProfessor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon MP 101/123$0.99£0.75€0.87
Professor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon MP 101/123$0.99£0.75€0.87Jun 12, 2026RawProfessor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon MP 101/123$1.79£1.35€1.58
Professor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon MP 101/123$1.79£1.35€1.58Jun 12, 2026RawProfessor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon DMG 101/123$1.59£1.20€1.40
Professor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon DMG 101/123$1.59£1.20€1.40Jun 12, 2026RawProfessor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon MP 101/123$0.99£0.75€0.87
Professor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon MP 101/123$0.99£0.75€0.87May 30, 2026RawPokemon TCG HeartGold SoulSilver Professor Oak's New Theory 101/123 EX$1.45£1.09€1.28
Pokemon TCG HeartGold SoulSilver Professor Oak's New Theory 101/123 EX$1.45£1.09€1.28May 10, 2026RawPokémon TCG Professor Oak's New Theory Heartgold Soulsilver 101/123 MP/HP$1.67£1.26€1.47
Pokémon TCG Professor Oak's New Theory Heartgold Soulsilver 101/123 MP/HP$1.67£1.26€1.47Apr 27, 2026RawProfessor Oak's New Theory–Pokémon TCG HeartGold SoulSilver 101/123 Uncommon MP 101/123$1.49£1.12€1.31
Professor Oak's New Theory–Pokémon TCG HeartGold SoulSilver 101/123 Uncommon MP 101/123$1.49£1.12€1.31Apr 18, 2026RawProfessor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Base Pokemon 101/123$1.60£1.20€1.41
Professor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Base Pokemon 101/123$1.60£1.20€1.41Mar 31, 2026RawPROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon Card 109/132$0.99£0.75€0.87
PROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon Card 109/132$0.99£0.75€0.87Mar 10, 2026RawProfessor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon MP 101/123$1.53£1.15€1.35
Professor Oak's New Theory 101/123 Uncommon HeartGold & SoulSilver Pokemon MP 101/123$1.53£1.15€1.35Mar 9, 202672010 POKEMON HEARTGOLD & SOULSILVER #101 PROFESSOR OAK'S NEW THEORY PSA 7 #101$3.39£2.55€2.99
72010 POKEMON HEARTGOLD & SOULSILVER #101 PROFESSOR OAK'S NEW THEORY PSA 7 #101$3.39£2.55€2.99Mar 2, 2026RawProfessor Oak's New Theory 101/123 HeartGold SoulSilver Uncommon Pokemon MP+ 101/123$1.54£1.16€1.36
Professor Oak's New Theory 101/123 HeartGold SoulSilver Uncommon Pokemon MP+ 101/123$1.54£1.16€1.36Jan 9, 2026RawPROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon - PL 109/132$0.99£0.75€0.87
PROFESSOR OAK'S NEW THEORY - 101/123 - HeartGold SoulSilver HGSS - Pokemon - PL 109/132$0.99£0.75€0.87Jan 7, 2026RawProfessor Oak's New Theory 101/123 Uncommon Pokemon HeartGold SoulSilver MP 101/123$1.75£1.32€1.54
Professor Oak's New Theory 101/123 Uncommon Pokemon HeartGold SoulSilver MP 101/123$1.75£1.32€1.54Jan 7, 2026RawProfessor Oak's New Theory 101/123 Uncommon Pokemon HeartGold SoulSilver MP 101/123$1.75£1.32€1.54
Professor Oak's New Theory 101/123 Uncommon Pokemon HeartGold SoulSilver MP 101/123$1.75£1.32€1.54Nov 18, 2025RawPokémon TCG Professor Oaks New Theory Heartgold Soulsilver 101/123 Regular MP.$2.29£1.72€2.02
Pokémon TCG Professor Oaks New Theory Heartgold Soulsilver 101/123 Regular MP.$2.29£1.72€2.02Nov 18, 2025RawProfessor Oak's New Theory Uncommon #101/123 HeartGold SoulSilver NM Pokemon 101/123$1.99£1.50€1.75
Professor Oak's New Theory Uncommon #101/123 HeartGold SoulSilver NM Pokemon 101/123$1.99£1.50€1.75More from HeartGold SoulSilver
All 124 cards →
Ho-Oh Legend (Top)
Ho-Oh Legend (Bottom)
Alph LithographCard facts
- Card number
- 101/123
- Rarity
- Uncommon
- Illustrator
- Ken Sugimori
- Set released
- Feb 10, 2010
- PSA population, all printings
- 3
- Printings priced
- 2
From the same set
HeartGold SoulSilver124 cards
HeartGold SoulSilver124 cards- Set value
- $4.3k£3.2k€3.8k
- 7 day move
- +0.4%
Looking for a different one? All 13 Professor Oak's New Theory cards we price →
The same card in other sets
Call of Legends83/95$3.46£2.60€3.05
World Championship Decks83/95$1.18£0.89€1.04
World Championship Decks83/95$0.85£0.64€0.75
World Championship Decks101/123$0.80£0.60€0.70
World Championship Decks101/123$0.67£0.50€0.59
World Championship Decks83/95$0.60£0.45€0.53
World Championship Decks101/123$0.49£0.37€0.43What moves the price of this card
The Professor Oak's New Theory on this page is the Reverse Holofoil printing from HeartGold SoulSilver, and it trades at $6.96£5.24€6.13 in near mint condition. The other 1 printing of the same card sits lower, which is normal: the scarcer print run always carries the premium.
Condition does most of the work below the surface. A copy with soft corners or a print line off centre trades well under the market price shown here, and a copy clean enough to grade trades well above it. Before you value your own copy, look at the corners under a light and check the centring on the back, where most cards give themselves away.