Professor Oak’s New Theory (League Promo) 101/123 Price – League & Championship Cards

Professor Oak's New Theory (League Promo) 101 from League & Championship Cards

#101 · League & Championship Cards

Raw price today$33.46

▼ 33.0% this week

PSA 10$45.92

PSA 9$40.00

SELLIt’s down 33% in a month, and it’s still falling this week.

Where to buy Professor Oak's New TheoryBuy raw on TCGplayerMarket price $33.46PokeInsider earns a commission when you buy through these links, at no extra cost to you.

SELL

PokeInsider signal

Why it’s a SELL

SELLHOLDBUY

▼Down 33% in 30 days
▼Still falling this week (-33%)
▼Down 33% in 90 days
▲Older set (2+ years): less sealed supply

A rules-based read of this card’s raw price trend, updated daily. How signals work · Market data, not financial advice.

Worth grading? Usually notA PSA 10 sells for $45.92, which doesn’t cover the raw price plus the $39.99 PSA grading fee, so even a perfect 10 loses money.

Check if it’s worth grading →View my collection →

Prices updated Oct 30, 2026. Raw: TCGplayer Near Mint market price. Graded: PriceCharting sold prices.

Professor Oak's New Theory (League Promo) (101/123) from League & Championship Cards is a Promo. It sells for about $33.46 raw and $45.92 in a PSA 10. The raw price is down 33.0% over the last 7 days and down 33.0% over 30 days.

It is the 183rd most valuable of the 209 League & Championship Cards cards we track, just behind Marowak (Pokemon League) [4th Place] ($33.73) and ahead of Delibird (Pokemon League) [3rd Place] ($32.95). The set’s most valuable card is Dragonite (National Championships) [Staff] ($997.00). Among the 1,202 Promo cards on PokeInsider, it ranks 1021st by raw price.

Professor Oak's New Theory price today

Raw$33.46Near Mint

PSA 9$40.001.2× raw

PSA 10$45.921.4× raw

BGS 10$60.001.8× raw · Pristine

CGC 10$100.003.0× raw

Raw price change

24 hours0.0%

7 days▼ -33.0%

30 days▼ -33.0%

Professor Oak's New Theory price chart

30-day high$49.95

30-day low$33.46

30-day average$47.20

Today vs. high33% below

Raw Near Mint market price on TCGplayer, one point per day.

Grading math

A PSA 10 sells for 1.4x the raw price. A PSA 9 sells for $40.00, 1.2x raw.

Buying a raw copy at $33.46 and paying $39.99 to grade it (PSA Value, for cards valued up to $500), you break even if roughly 100% of your copies come back a PSA 10 (counting the rest at PSA 9 value). Grading fees and gem rates vary; this is a rough guide, not a guarantee.

Run the numbers for Professor Oak's New Theory in our grading calculator (your own cost, gem rate, tier and fees).