Professor Oak's New Theory

HeartGold & SoulSilver · No. 101/123

Uncommon EN Trainer

Current value

$6.96

TCGplayer Near Mint

Prices

Variant	TCGplayer	Cardmarket
Normal	$0.80 Low $0.80 · High $0.80	€0.19
Reverse Holofoil	$6.96 Low $6.96 · High $6.96	No price

TCGplayer prices are Near Mint market averages, Cardmarket prices are 30-day averages in EUR. Refreshed every 15 minutes, as of Sep 16, 2026, 7:30 PM UTC.

Details

Rarity

Uncommon

Artist

Ken Sugimori

Number

101/123

Expansion

HeartGold & SoulSilver

Series

HeartGold & SoulSilver

Subtypes

Supporter

Price history

TCGplayer Cardmarket

$0.22 -$0.09 (-29.0%)

$0.00 $0.20 $0.40 $0.60

Aug 17 Aug 28 Sep 4 Sep 10 Sep 16

Reverse Holofoil · Cardmarket average · last 30 days, average price by day

Date	Average
Aug 17, 2026	$0.31
Aug 18, 2026	$0.29
Aug 22, 2026	$0.27
Aug 23, 2026	$0.27
Aug 25, 2026	$0.25
Aug 26, 2026	$0.59
Aug 28, 2026	$0.59
Aug 29, 2026	$0.55
Aug 30, 2026	$0.50
Aug 31, 2026	$0.50
Sep 1, 2026	$0.40
Sep 4, 2026	$0.39
Sep 5, 2026	$0.36
Sep 6, 2026	$0.31
Sep 7, 2026	$0.29
Sep 8, 2026	$0.24
Sep 9, 2026	$0.21
Sep 10, 2026	$0.20
Sep 11, 2026	$0.20
Sep 12, 2026	$0.20
Sep 13, 2026	$0.16
Sep 15, 2026	$0.22
Sep 16, 2026	$0.22

7D 1M 3M 6M 1Y

Normal Reverse Holofoil

Where to buy

TCGplayer Search Professor Oak's New Theory on TCGplayer Cardmarket Search Professor Oak's New Theory on Cardmarket eBay Search Professor Oak's New Theory on eBay

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Professor Oak's New Theory is card 101/123 of HeartGold & SoulSilver, a HeartGold & SoulSilver series English Pokémon TCG expansion. Prices and price history here come from TCGplayer and Cardmarket and refresh every 15 minutes, and you can scan and track your HeartGold & SoulSilver cards in the Arca TCG app.