Pokémon TCG · XY Trainer Kit: Sylveon & Noivern · #101
Professor Oak's New Theory (League Promo) #101 price
XY Trainer Kit: Sylveon & Noivern101Market prices
90-day range · TCGplayer
Professor Oak's New Theory (League Promo) (#101, Promo) is a card from Pokémon set XY Trainer Kit: Sylveon & Noivern. Near Mint, it has a market price of about $39.65 on TCGplayer (updated November 7, 2026). Over the last 7 days, its TCGplayer market price fell 0.9%. Over the last 30 days, its TCGplayer market price rose 18.5%. Over the last 90 days, its TCGplayer market price fell 20.6%. Its 90-day TCGplayer market price range is $32.50 to $49.95. Among the 936 Promo cards of XY Trainer Kit: Sylveon & Noivern, it is the 226th most valuable.
Professor Oak's New Theory (League Promo) #101 prices by finish
| Finish | TCGplayer | Cardmarket |
|---|---|---|
| Reverse Holo | $39.65 | – |
Near Mint prices: TCGplayer market price, updated November 7, 2026.
Price changes by finish
| Finish | Price | 7 days | 30 days | 90 days | 90-day range |
|---|---|---|---|---|---|
| Reverse Holo | TCGplayer market price | −0.9% | +18.5% | −20.6% | $32.50 – $49.95 |
Change of the same Near Mint price (same market, same finish) against 7, 30 and 90 days ago; range: its lowest and highest daily value over the last 90 days. Only where the price history supports a figure; lowest listings have none.
Price charts, graded prices from PSA, CGC, BGS, SGC, TAG and ACE, PSA population counts and recent sold listings are in Sparkl Pro.
About this card
- Number
- 101
- Rarity
- Promo
- Finishes
- Reverse Holo
- Rank in its rarity
- 226th of 936 Promo cards
- Against its rarity’s median
- 3.7× the median ($10.71)
- Released
- July 1, 1999
- Print language
- English
How this page is made: Near Mint prices from TCGplayer and Cardmarket, refreshed daily; ranks, medians and comparisons are computed by Sparkl from those prices.
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