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, 5:58 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 +$0.01 (+4.8%)

$0.00 $0.20 $0.40 $0.60

Jun 18 Jul 7 Jul 28 Aug 25 Sep 16

Reverse Holofoil · Cardmarket average · last 90 days, average price by day

Date	Average
Jul 3, 2026	$0.31
Jul 4, 2026	$0.31
Jul 5, 2026	$0.31
Jul 6, 2026	$0.30
Jul 7, 2026	$0.30
Jul 8, 2026	$0.30
Jul 9, 2026	$0.30
Jul 11, 2026	$0.30
Jul 12, 2026	$0.30
Jul 13, 2026	$0.30
Jul 14, 2026	$0.30
Jul 15, 2026	$0.30
Jul 16, 2026	$0.30
Jul 17, 2026	$0.24
Jul 18, 2026	$0.24
Jul 19, 2026	$0.32
Jul 20, 2026	$0.32
Jul 21, 2026	$0.32
Jul 22, 2026	$0.32
Jul 23, 2026	$0.31
Jul 24, 2026	$0.31
Jul 27, 2026	$0.25
Jul 28, 2026	$0.23
Jul 29, 2026	$0.23
Jul 31, 2026	$0.21
Aug 1, 2026	$0.21
Aug 2, 2026	$0.21
Aug 3, 2026	$0.18
Aug 5, 2026	$0.16
Aug 6, 2026	$0.42
Aug 7, 2026	$0.44
Aug 8, 2026	$0.45
Aug 9, 2026	$0.45
Aug 11, 2026	$0.40
Aug 12, 2026	$0.37
Aug 14, 2026	$0.33
Aug 16, 2026	$0.31
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.