Professor Oak's New Theory

HeartGold & SoulSilver · #101 · Uncommon

$6.92US · TCGplayer

$0.29EU · Cardmarket

+17%7-day (EU)

+35%30-day (EU)

UncommonRarity

#85 of 124Rank in set

Price detail

Market read: heating up — +17% in 7 days; +35% over 30 days; a steady climb built over the month, not a one-week pop — the kind of move that tends to hold; notably pricier in the US.

TCGplayer (US) (reverseHolofoil)

Tier	USD
Low	$4.28
Market	$6.92
Mid	$6.76
High	$63.10

Every print variant (2)

Variant	Market	Low – High
Reverse Holofoil	$6.92	$4.28 – $63.10
Normal	$0.89	$0.25 – $20.00

The same card, different print: $6.92 vs $0.89 — a 7.8× spread. Check which variant a listing actually is before you judge the price.

Cardmarket (EU)

Metric	EUR
Trend	€0.27
Avg 1-day	€0.20
Avg 7-day	€0.23
Avg 30-day	€0.20
Low	€0.02

FAQ

How much is Professor Oak's New Theory (HeartGold & SoulSilver #101) worth?

As of our 2026-08-07 data, Professor Oak's New Theory from HeartGold & SoulSilver is worth about $6.92 (TCGplayer US market) and around €0.29 (Cardmarket EU). Prices move constantly — check the live links before buying or selling.

Is Professor Oak's New Theory rare?

Its rarity is listed as Uncommon and it ranks #85 of 124 by value in HeartGold & SoulSilver. Rarity is the printed classification — it does not by itself guarantee value.

What's the most valuable card in HeartGold & SoulSilver?

By current US market price, it's Grass Energy at $999.

Is Professor Oak's New Theory's price going up or down?

On the Cardmarket (EU) trend it's +17% over 7 days, +35% over 30 days. That's an early momentum signal, not a guarantee — collectible prices are volatile and can reverse quickly.

Where can I check Professor Oak's New Theory's live price?

See the current TCGplayer (US) market price here: Professor Oak's New Theory on TCGplayer ↗.