Professor Oak's New Theory 101/123 — HeartGold & SoulSilver
Professor Oak's New Theory is card 101/123 from HeartGold & SoulSilver (HeartGold & SoulSilver, 2010), a Uncommon Trainer card illustrated by Ken Sugimori.
Professor Oak's New Theory price
Live prices for this card aren't available right now. Use the eBay UK sold-price link below for current values.
Prices: TCGplayer market (US, $) and Cardmarket trend (EU, €) via the Pokémon TCG API, each shown with the date it was last updated. Indicative only — UK sold prices on eBay are often the best guide.
Card details
- Number
- 101/123
- Rarity
- Uncommon
- Card type
- Trainer · Supporter
- Illustrator
- Ken Sugimori
- Released
- 10 February 2010
About this card
Professor Oak's New Theory 101/123 is card 101 in HeartGold & SoulSilver (123 numbered cards, plus 1 secret rares). It's one of 38 Uncommon cards in the set — 31% of 124. There are 2 English cards named “Professor Oak's New Theory”. This is the 1st — the first ever printed. Ken Sugimori illustrated 11 cards in HeartGold & SoulSilver and 1114 English cards in total.
It isn't legal in the 2026–27 Standard format, so demand comes mainly from collectors.
Is Professor Oak's New Theory 101/123 worth anything?
We don't have a live market price for this card at the moment. The price you'll get in the UK depends mostly on condition: check the corners, edges and surface, and whether the artwork is well centred. Damaged cards sell for much less, while professionally graded copies in top condition can sell for far more.
To be sure you have the right card, match the set symbol and the number 101/123 printed at the bottom of your card. Then compare completed eBay UK listings — sold prices, not asking prices — for copies in similar condition.
Questions people ask
What set is Professor Oak's New Theory 101/123 from?
HeartGold & SoulSilver, released 10 February 2010 in the HeartGold & SoulSilver series. Look for the set symbol next to the number 101/123.
How rare is Professor Oak's New Theory 101/123?
It's an Uncommon — one of 38 cards at that rarity in HeartGold & SoulSilver.
Who illustrated Professor Oak's New Theory 101/123?
Ken Sugimori, who has 1114 English Pokémon cards credited.
How many Professor Oak's New Theory cards are there?
2 in English, from HeartGold & SoulSilver (2010) to Call of Legends (2011).
Data checked · How we build our guides