Professor Oak's New Theory
SetHeartGold & SoulSilver
Year2010
RarityUncommon
Number#101
Ungraded
$1.56
25 sales · last Jul 8, 2026
PSA 10
$999.95
1 sales · last May 10, 2026
Professor Oak's New Theory price guide
Professor Oak's New Theory is a collectible Pokémon card from the HeartGold & SoulSilver expansion (2010). Setlot tracks 26 recorded sales for this card across 2 grade tiers, 25 of them in the last 90 days. PSA 10 copies have a 90-day median of $999.95. Ungraded copies currently trade around $1.56. The top grade commands 641× the ungraded price — grading meaningfully changes what this card is worth. The highest sale on record is $999.95 (PSA 10, May 10, 2026). 41 listings are live right now with asks from $0.99.
Price history
Grading premium
Median graded price vs. the ungraded copy ($1.56) — a rough read on whether grading pays off.
PSA 10
641×
$999.95
Live listings
Search on eBay ↗Lowest asks per grade. Older listings may have ended — “seen” is when we last confirmed each one.
| Grade | Listing | Marketplace | Seen | Price |
|---|---|---|---|---|
| Ungraded 41 tracked | Pokemon - Professor Oak's New Theory - 101/123 - Uncommon - HeartGold SoulSilver blacklotusgogames | eBay | 1mo ago | $0.99↗ |
| Professor Oak's New Theory Uncommon HeartGold SoulSilver 101/123 MP briadye58 | eBay |
Recent sales by grade· last 90 days
| Grade | Sold | Median | Range |
|---|---|---|---|
| Ungraded | 24 | $1.56 | $0.99 – $3.01 |
| PSA 10 | 1 | $999.95 | $999.95 |
Recent sales
| Date | Grade | Title | Sold on | Price |
|---|---|---|---|---|
| Jul 8, 2026 | Ungraded | Professor Oak's New Theory HeartGold SoulSilver 101/123 Pokemon Card↗ | eBay | $1.99 |
| Jul 5, 2026 | Ungraded | Professor Oak’s New Theory 101/123 Uncommon Heart Gold Soul Silver Pokemon↗ | eBay | $1.58 |
| Jul 1, 2026 | Ungraded | Pokemon - Professor Oak's New Theory - 101/123 - Uncommon - HeartGold SoulSilver↗ | eBay | $1.03 |
| Jun 27, 2026 | Ungraded | PROFESSOR OAK'S NEW THEORY - 101/123 - WORLD CHAMPIONSHIP DECK - Pokemon - PL↗ |
