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  6. Professor Oak's New Theory

Pokémon · HeartGold SoulSilver · #101/123 · Uncommon

Professor Oak's New Theory

Pokémon card price for Professor Oak's New Theory: $6.99 market, from $4.00 at the cheapest listing, Reverse Holofoil printing, updated Oct 19, 2026. Full price history since Feb 8, 2024 below.

Market price · Reverse Holofoil · Oct 19, 2026
$6.99
+0.4% this week · +0.4% in 30 days
Buy on eBay →
1 day0.0%
7 days+0.4%
30 days+0.4%
90 days+1.0%
1 year+29.2%
All time+16.7%

Sellers right now

$4.00lowest listing$62.88highest
Market price$6.99
Mid listing$17.04
30-day avg$6.97

Market price is what a near-mint copy actually sold for. The cheapest listing is what a seller asks today — on thin markets the two differ a lot.

Where to buy

TCGplayer$6.99

One year

$5.4152-week low$6.9952-week high
In the range100%
All-time low$3.06
All-time high$6.99
First priceFeb 8, 2024
Reverse Holofoil · market price
$2.82$4.34$5.86$7.38
$6.99
Feb 2024Jan 2025Nov 2025Oct 2026
TCGplayer market price · via tcgcsvtcgrate.com

Price story

Our price record for Professor Oak's New Theory (Reverse Holofoil) begins in February 2024 at $5.99; the market price today is $6.99, up 16.7% since then. In the last year the price changed +29.2% and ranged from $5.41 to $6.99, and it now trades near the top of that range. Today's price is the highest we have recorded for this card. Listings currently start at $4.00; over the last 30 days the market price averaged $6.97.

Printings

PrintingMarketLowHigh7d
Reverse Holofoil$6.99$4.00$62.88+0.4%
Normal$0.73$0.25$20.00−1.4%

The card in play

HP0
Type
Supporter
Stage
Supporter
Shuffle your hand into your deck. Then, draw 6 cards.
Ability

You can play only one Supporter each turn. When you play this card, put it next to your Active Pokemon. When your turn ends, discard this card.

Other printings of Professor Oak's New Theory

2 more · $3.46 – $33.46
All printings
Professor Oak's New Theory - 101/123 (League Promo) (101/123), League & Championship Cards — Pokémon card price 0.0% 7d Professor Oak's New Theory - 101/123 (League Promo) League & Championship Cards · #101/123 $33.46 Professor Oak's New Theory (83/95), Call of Legends — Pokémon card price 0.0% 7d Professor Oak's New Theory Call of Legends · #83/95 $3.46

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