UNCOMMON · TRAINER

Professor Oak's New Theory 101/123 · HeartGold & SoulSilver (2010) price

Professor Oak's New Theory is card 101/123 in HeartGold & SoulSilver (2010), rarity Uncommon. Supporter, illustrated by Ken Sugimori. TCGplayer lists it at $0.74 for the normal variant. Current listings run from $0.25 to $20.00. 2 variants are priced: normal $0.74, reverse holofoil $6.99. By TCGplayer price it ranks #105 of 124 priced cards in HeartGold & SoulSilver.

← Professor Elm's Training Method 100/123 · Switch 102/123 →

TCGPLAYER MARKET PRICE · NORMAL

$0.74

As of October 15, 2026. An informational estimate, not an appraisal or an offer to buy or sell.

Prices by variant, US dollars: market, and the low to high range of current listings

• Normal$0.74

  LOW $0.25MID $0.75HIGH $20.00

• Reverse Holofoil$6.99

  LOW $4.00MID $14.08HIGH $62.92

VIEW ON TCGPLAYER →

Source: TCGplayer. This product uses TCGplayer data but is not endorsed or certified by TCGplayer.

Card details

Set

HeartGold & SoulSilver

Number

101/123

Rarity

Uncommon

Type

Trainer · Supporter

Artist

Ken Sugimori

Released

Feb 10, 2010

Series

HeartGold & SoulSilver