Market price · Normal
$0.71
TCGplayer (US) · updated Nov 2, 2026
≈ $2.02 delivered +$1.31 shipping (TCGplayer minimum on orders under $5)
Estimate for one card from a US seller. Buying several cards from the same seller shares one shipping fee. Shipping to Canada varies by seller.
TCGplayer · US market
Market
$0.71
Low
—
Mid
—
Printings (12)
Collection tracking (owned printings, condition, what you paid) opens October 25 — bookmark this page and check back.
You can play only one Supporter card each turn. When you play this card, put it next to your Active Pokémon. When your turn ends, discard this card. Shuffle your hand into your deck. Then, draw 6 cards.
- Retreat
- 0
- Illustrator
- Ken Sugimori
- Format
- Not Standard
- Released
- February 10, 2010
Price history
- Normal$0.71
- Reverse Holo$6.99
- Normal · Igor Costa Stamp$49.95
Show as table
| Date | Normal | Reverse Holo | Normal · Igor Costa Stamp |
|---|---|---|---|
| Nov 2, 2026 | $0.71 | $6.99 | $49.95 |
| Nov 1, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 31, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 30, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 29, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 28, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 27, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 26, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 25, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 24, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 23, 2026 | $0.71 | $6.99 | $49.95 |
| Oct 22, 2026 | $0.72 | $6.99 | $49.95 |
| Oct 21, 2026 | $0.72 | $6.99 | $49.95 |
| Oct 20, 2026 | $0.72 | $6.99 | $49.95 |
| Oct 19, 2026 | $0.73 | $6.99 | — |
| Oct 18, 2026 | $0.73 | $6.99 | — |
| Oct 17, 2026 | $0.73 | $6.99 | — |
| Oct 16, 2026 | $0.73 | $6.99 | — |
| Oct 15, 2026 | $0.73 | $6.99 | — |
| Oct 14, 2026 | $0.74 | $6.99 | — |
| Oct 13, 2026 | $0.76 | $6.96 | — |
| Oct 12, 2026 | $0.76 | $6.96 | — |
| Oct 11, 2026 | $0.75 | $6.96 | — |
| Oct 10, 2026 | $0.75 | $6.96 | — |
| Oct 9, 2026 | $0.75 | $6.96 | — |
| Oct 8, 2026 | $0.75 | $6.96 | — |
| Oct 7, 2026 | $0.75 | $6.96 | — |
| Oct 6, 2026 | $0.75 | $6.96 | — |
| Oct 5, 2026 | $0.75 | $6.96 | — |
| Oct 4, 2026 | $0.75 | $6.96 | — |
| Oct 3, 2026 | $0.75 | $6.96 | $49.95 |
Showing the last 30 days. Full price history is on Elite and Master
Live on eBay
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Market trend
As of Nov 2, 2026 · TCGplayer (US)
- 7 days
- 0.0%
- 30 days
- −5.3%
- vs set · 7D
- +1.2%-1.2 pts vs set
- Volatility (30D) Elite+
- —
| Printing | Price | 1D | 7D | 30D |
|---|---|---|---|---|
| Normal | $0.71 | 0.0% | 0.0% | −5.3% |
| Reverse Holo | $6.99 | 0.0% | 0.0% | +0.4% |
| Normal · Christopher Kan Stamp | $0.67 | 0.0% | 0.0% | n/a |
| Normal · Gustavo Wada Stamp | $0.49 | 0.0% | 0.0% | n/a |
| Normal · Igor Costa Stamp | $49.95 | 0.0% | 0.0% | 0.0% |
| Normal · Yuta Komatsuda Stamp | $0.80 | 0.0% | 0.0% | 0.0% |
| Professor Program Reverse Holo | $0.42 | 0.0% | 0.0% | n/a |
Price history by source · Normal
- TCGplayer
Show as table
| Date | Value | Source |
|---|---|---|
| Nov 2, 2026 | $0.71 | TCGplayer |
| Nov 1, 2026 | $0.71 | TCGplayer |
| Oct 31, 2026 | $0.71 | TCGplayer |
| Oct 30, 2026 | $0.71 | TCGplayer |
| Oct 29, 2026 | $0.71 | TCGplayer |
| Oct 28, 2026 | $0.71 | TCGplayer |
| Oct 27, 2026 | $0.71 | TCGplayer |
| Oct 26, 2026 | $0.71 | TCGplayer |
| Oct 25, 2026 | $0.71 | TCGplayer |
| Oct 24, 2026 | $0.71 | TCGplayer |
| Oct 23, 2026 | $0.71 | TCGplayer |
| Oct 22, 2026 | $0.72 | TCGplayer |
| Oct 21, 2026 | $0.72 | TCGplayer |
| Oct 20, 2026 | $0.72 | TCGplayer |
| Oct 19, 2026 | $0.73 | TCGplayer |
| Oct 18, 2026 | $0.73 | TCGplayer |
| Oct 17, 2026 | $0.73 | TCGplayer |
| Oct 16, 2026 | $0.73 | TCGplayer |
| Oct 15, 2026 | $0.73 | TCGplayer |
| Oct 14, 2026 | $0.74 | TCGplayer |
| Oct 13, 2026 | $0.76 | TCGplayer |
| Oct 12, 2026 | $0.76 | TCGplayer |
| Oct 11, 2026 | $0.75 | TCGplayer |
| Oct 10, 2026 | $0.75 | TCGplayer |
| Oct 9, 2026 | $0.75 | TCGplayer |
| Oct 8, 2026 | $0.75 | TCGplayer |
| Oct 7, 2026 | $0.75 | TCGplayer |
| Oct 6, 2026 | $0.75 | TCGplayer |
| Oct 5, 2026 | $0.75 | TCGplayer |
| Oct 4, 2026 | $0.75 | TCGplayer |
| Oct 3, 2026 | $0.75 | TCGplayer |
Quick facts
Questions & answers
- How much is Professor Oak's New Theory worth?
- Professor Oak's New Theory (101/123, HeartGold SoulSilver) is worth about $0.71: the TCGplayer market price of its Normal printing, updated November 2, 2026.
- What printings of Professor Oak's New Theory 101/123 exist?
- Professor Oak's New Theory 101/123 exists in 12 printings: Normal, Reverse Holo, Normal · David Cohen Stamp, Normal · Shuto Itagaki Stamp, Normal · Gustavo Wada Stamp, Normal · Zachary Bokhari Stamp, Normal · Christopher Kan Stamp, Normal · Igor Costa Stamp, Normal · Chase Moloney Stamp, Normal · Yuta Komatsuda Stamp, Normal · Ross Cawthorn Stamp, and Professor Program Reverse Holo.
- What set is Professor Oak's New Theory from?
- Professor Oak's New Theory is card 101/123 of HeartGold SoulSilver (HeartGold & SoulSilver), released on February 10, 2010.
- What rarity is Professor Oak's New Theory 101/123?
- Professor Oak's New Theory (101/123, HeartGold SoulSilver) is a Uncommon card.
- Who illustrated Professor Oak's New Theory 101/123?
- The artwork of Professor Oak's New Theory (101/123, HeartGold SoulSilver) is by Ken Sugimori.
Answers are generated from Tallgrass's own catalog and market data.