How it’s built
- Took March 2026 market values from TCGplayer, a card marketplace, as quoted by a collectibles news site: Umbreon $1,195.57 against $62.66 to $296.96 for four comparable cards.
- The Pikachu comparison uses a price-guide site's range, $991 to $1,195, against $280.
What we assumed
- Market-value trackers reflect what cards actually sell for.They are vendor estimates from a single snapshot, not dated sale prices.
- The Pikachu card is a fair comparison.It is a different rarity and comes from a different source, so it is given as a range rather than one figure.
Sanity check
One month, one set, mostly one source. Resale values show collector demand; The Pokémon Company earns nothing from them.
Where it comes from
Our calculation from other figures in the trainer’s notes:
- EstimateDerived same-set premium: Umbreon excluding SIR against Pikachu excluding (Prismatic Evolutions), vendor estimate, March 20263.9 x
- EstimateSame-set premium: Umbreon excluding SIR over Sylveon excluding SIR (Prismatic Evolutions), TCGplayer market, Mar 20264.03 x
Show the working
- Times against Sylveon ex SIR: 4.03
- Times against Espeon ex SIR: 5.34
- Times against Eevee ex SIR: 9.51
- Times against Raging Bolt ex SIR: 19.1
- Times against mean of four SIRs: 6.74
- Times against Pikachu ex hyper rare cross source: 3.54 to 4.27
- 1,195.57 / 296.96 = 4.03
- / 223.84 = 5.34
- / 125.75 = 9.51
- / 62.66 = 19.08
- mean of four = (296.96 + 223.84 + 125.75 + 62.66) / 4 = 177.30, 1,195.57 / 177.30 = 6.74
- Pikachu: 991 / 280 = 3.54 to 1,195 / 280 = 4.27
- 450 / 280 = 1.61, 309 / 280 = 1.10, 300 / 280 = 1.07