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

Reverse Holofoil · Near Mint

$6.99

TCGplayer market price (an average of recent sales)

As of Oct 19 (yesterday). Unchanged since Oct 14.

Change

7d+0.4% +$0.0330d+0.4% +$0.0390d+1.0% +$0.071y+29.2% +$1.58

For the Reverse Holofoil printing.

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

Price trend

Oct 12 $6.96 → Oct 19, 2026 $6.99 +0.4%

$6.96low$6.90$7.10$6.99
Oct 12, 2026Oct 14, 2026Oct 15, 2026Oct 16, 2026Oct 19, 2026

Sep 19 $6.96 → Oct 19, 2026 $6.99 +0.4%

$6.96low$6.90$7.10$6.99
Sep 19, 2026Sep 29, 2026Oct 4, 2026Oct 9, 2026Oct 19, 2026

Jul 21 $6.92 → Oct 19, 2026 $6.99 +1.0%

$6.92$6.80$7.10$6.99
Jul 21, 2026Aug 20, 2026Sep 4, 2026Sep 19, 2026Oct 19, 2026

Oct 19, 2025 $5.41 → Oct 19, 2026 $6.99 +29.2%

$5.41$6.00$6.50$6.99
Oct 19, 2025Feb 17, 2026Apr 19, 2026Jun 19, 2026Oct 19, 2026

Feb 8, 2024 $5.99 → Oct 19, 2026 $6.99 +16.7%

$3.06$4.00$5.00$6.00$6.99
Feb 8, 2024Jan 1, 2025Jun 14, 2025Nov 25, 2025Oct 19, 2026

Record

Price history Feb 8, 2024 to Oct 19, 2026

Highest (Reverse Holofoil)$6.99Oct 14, 2026 to Oct 19, 2026 (latest price)
Lowest (Reverse Holofoil)$3.06Apr 29, 2024 to Jun 18, 2024

Price changes, last 30 days

DatePriceChange
Oct 14$6.96 → $6.99+0.4%Show on chart

Vs its set

Over the 90 days to Oct 19, 2026: the Reverse Holofoil printing +1.0%; 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.