Professor Oak's New Theory

HeartGold SoulSilver (2010), Pokémon, 101/123, Uncommon, art by Ken Sugimori

Professor Oak's New Theory
PrintingNormal $0.73Reverse Holofoil $6.99

Normal · Near Mint

$0.73

TCGplayer market price (an average of recent sales)

As of Oct 19 (yesterday). Unchanged since Oct 16.

Listed median$0.74Normal asks on TCGplayer as of Oct 19

Change

7d−1.4% −$0.0130d−1.4% −$0.0190d−19.8% −$0.181y−6.4% −$0.05

For the Normal printing.

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Related cards

Alph Lithograph$143Same setAmpharos$8.74Same setBayleef$2.00Same setEnergy Switch$5.20Same setAlakazam$72.30Same artistMewtwo$78.81Same artist

Price trend

Oct 12 $0.74 → Oct 19, 2026 $0.73 −1.4%

$0.76$0.74$0.75$0.73
Oct 12, 2026Oct 14, 2026Oct 15, 2026Oct 16, 2026Oct 19, 2026

Sep 19 $0.74 → Oct 19, 2026 $0.73 −1.4%

$0.76$0.74$0.75$0.73
Sep 19, 2026Sep 29, 2026Oct 4, 2026Oct 9, 2026Oct 19, 2026

Jul 21 $0.91 → Oct 19, 2026 $0.73 −19.8%

$0.91$0.75$0.80$0.85$0.73
Jul 21, 2026Aug 20, 2026Sep 4, 2026Sep 19, 2026Oct 19, 2026

Oct 19, 2025 $0.78 → Oct 19, 2026 $0.73 −6.4%

$0.93$0.80$0.85$0.90$0.73
Oct 19, 2025Feb 17, 2026Apr 19, 2026Jun 19, 2026Oct 19, 2026

Feb 8, 2024 $0.78 → Oct 19, 2026 $0.73 −6.4%

$0.98$0.65$0.70$0.80$0.90$0.73
Feb 8, 2024Jan 1, 2025Jun 14, 2025Nov 25, 2025Oct 19, 2026

Record

Price history Feb 8, 2024 to Oct 19, 2026

Highest (Normal)$0.98Jan 11, 2025 only
Lowest (Normal)$0.65Jul 24, 2025 to Jul 26, 2025
Vs highest26% below $0.98

Price changes, last 30 days

DatePriceChange
Sep 24$0.74 → $0.75+1.4%Show on chart
Oct 12$0.75 → $0.74−1.3%Show on chart
Oct 13$0.74 → $0.76+2.7%Show on chart
Oct 15$0.76 → $0.74−2.6%Show on chart
Oct 16$0.74 → $0.73−1.4%Show on chart

Vs its set

Over the 90 days to Oct 19, 2026: the Normal printing −19.8%; the median other card in HeartGold SoulSilver +14.7% (123 other cards, each at its tracked printing).

Keep exploring

Same artistMore by Ken SugimoriSame setMore from HeartGold SoulSilverThe methodResearchGamesAll Pokémon setsTodayBiggest moves in Pokémon

Live market

Newest TCGplayer value: Oct 19, 2026. Prices in USD. Card names and images © their respective publishers. See how these prices are made.