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  6. Professor Oak's New Theory - 101/123 (League Promo)

Pokémon · League & Championship Cards · #101/123 · Promo

Professor Oak's New Theory - 101/123 (League Promo)

Pokémon card price for Professor Oak's New Theory - 101/123 (League Promo): $33.46 market, though the cheapest copy on sale asks $44.90, Reverse Holofoil printing, updated Oct 20, 2026. Full price history since Feb 8, 2024 below.

Market price · Reverse Holofoil · Oct 20, 2026
$33.46
0.0% this week · +2.6% in 30 days
Buy on eBay →
1 day0.0%
7 days0.0%
30 days+2.6%
90 days−33.0%
1 year+157.4%
All time+89.6%

Sellers right now

$44.90lowest listing$289.76highest
Market price$33.46
Mid listing$49.50
30-day avg$33.09

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$33.46

One year

$13.0052-week low$49.9552-week high
In the range55%
All-time low$13.00
All-time high$49.95
First priceFeb 8, 2024
Reverse Holofoil · market price
$10.78$25.07$39.36$53.65
$33.46
Oct 2025Feb 2026Jun 2026Oct 2026
TCGplayer market price · via tcgcsvtcgrate.com

Price story

Our price record for Professor Oak's New Theory - 101/123 (League Promo) begins in February 2024 at $17.65; the market price today is $33.46, up 89.6% since then. In the last year the price changed +157% and ranged from $13.00 to $49.95, and it now trades in the middle of that range. Its all-time high in our data is $49.95, still 49.3% above the current price. The cheapest listing right now is $44.90, and the 30-day average market price is $33.09.

Printings

PrintingMarketLowHigh7d
Reverse Holofoil$33.46$44.90$289.760.0%

The card in play

Type
Supporter
Ability

You can only play 1 Supporter card each turn. When you play this card, put it next to your Active Pokémon. When your turn ends, discard this card.

Shuffle your hand into your deck. Then, draw 6 cards.

Other printings of Professor Oak's New Theory

2 more · $3.46 – $33.46
All printings
Professor Oak's New Theory (101/123), HeartGold SoulSilver — Pokémon card price +0.4% 7d Professor Oak's New Theory HeartGold SoulSilver · #101/123 $6.99 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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