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Professor Oak's New Theory
Uncommon · #101/123
Professor Oak's New Theory #101/123 (HeartGold SoulSilver) is worth about $6.96 today, the Near Mint market price from TCGplayer sales as of 2026-10-03.
price trend and all-time high: more ↓less ↑
Professor Oak's New Theory #101/123 is holding steady: $6.96 today, flat over 30 days and at its all-time high (2026-10-03). TCGplayer market price as of 2026-10-03, tracked daily since 2024-02-08. chart →
illustrated by Ken Sugimori
Price data for your app or store: API and daily history since 2024 · CSV download
LOADING TAPE
WORTH GRADING?
WHERE TO BUY AND SELL
Reverse Holofoil · no eBay scan yetBuy-side estimate
$6.96
THINa patient buyer pays about $6.96 delivered, from live asks, not sales
show the work →
TCGplayer only, no eBay scan yet
| TCGplayer market | $6.96 | verify ↗ |
| TCGplayer lowest ask | $4.00 |
Single source: TCGplayer market (no usable eBay asks in the last scan).
The verdict · premium
Cards at their high after a flat month were higher 90 days later 61% of the time in our archive since 2024 (55,234 cases).
The median move, the verdict and the grade-worthy math: try Premium free for 7 days →GAME DATA[ + ] SHOW[ × ] HIDE
- CARD TYPE
- Supporter
- STAGE
- Supporter
- HP
- 0
- ATTACK 1
- Shuffle your hand into your deck. Then, draw 6 cards.
- CARD TEXT
- You can play only one Supporter each turn. When you play this card, put it next to your Active Pokemon. When your turn ends, discard this card.
MORE BY KEN SUGIMORI
FULL CATALOG →
MORE FROM HEARTGOLD SOULSILVER
FULL SET →
PRICE FAQ
What would a card shop pay for Professor Oak's New Theory?
+×
Shops and show vendors commonly offer about 70% of market in cash and 80% in store credit. At today's $6.96 market price that is roughly $4.87 cash or $5.57 trade for a near-mint copy. Selling it yourself on TCGplayer or eBay nets more after fees; see the seller-net answer below.
What is Professor Oak's New Theory (HeartGold SoulSilver) worth today?
+×
Professor Oak's New Theory [Reverse Holofoil] has a TCGplayer market price of $6.96 as of 2026-10-02. Across 2 tracked variants, latest prices range from $0.75 to $6.96.
Is Professor Oak's New Theory going up or down in price?
+×
Professor Oak's New Theory #101/123 is holding steady: $6.96 today, flat over 30 days and at its all-time high (2026-10-03). TCGplayer market price as of 2026-10-03, tracked daily since 2024-02-08.
What is the all-time high price for Professor Oak's New Theory?
+×
The Near Mint price, the one quoted at the top of this page, peaked at $6.96 (2026-10-03). In TickerMint's daily data (since February 2024), the TCGplayer market price for Professor Oak's New Theory [Reverse Holofoil] (all conditions) peaked at $6.96 (2026-09-13) and bottomed at $3.06 (2024-04-29).
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