Every Professor Oak's New Theory card we price, most valuable first. Prices are what copies actually sold for, updated daily.
What a Professor Oak's New Theory card is worth
The most valuable Professor Oak's New Theory on this list is Professor Oak's New Theory (League Promo) from League & Championship Cards at $32.50£24.46€28.62, and the 12 priced copies across 4 sets are worth $49£37€43 together. Most of that sits in a handful of printings: the older the set and the scarcer the print run, the wider the gap to the rest.
Professor Oak's New Theory is printed in Japanese as well: 1 cards across 1 sets, the most valuable of them Professor Oak's New Theory from HeartGold Collection at $1£0.75€0.88. Switch the list above to Japanese to read those, or to Both to rank the two catalogues against each other.
The highest PSA 10 on record for Professor Oak's New Theory sold for $72£54.19€63.41. reverse holo printings are priced separately from the standard card, because they do not trade at the same money.
If you are trying to identify which Professor Oak's New Theory you have, the set name is printed on the card and the collector number sits in the bottom corner. Open the card here and the page carries every printing of it, the graded prices, and whether grading the copy is worth the fee. Sets to start with: League & Championship Cards, HeartGold SoulSilver, Call of Legends.