Storm Emeralda shipped in Japan on 31 July 2026: 113 cards, 76 in the main set and 37 secret, built around the return of Mega Rayquaza ex. Five days is not long enough to know what a set is worth. It is long enough to watch the first correction happen, and this one has a shape worth reading.
A note on how these numbers are built
Japanese card prices come in at least three incompatible flavours: 買取, what a shop pays you; 販売, what a shop charges you; and transaction data from marketplaces. Pairing the highest launch figure from one source with the lowest current figure from another produces enormous, meaningless percentages. Every number below is computed inside a single source and a single metric, and the metric is named. Where two sources disagree, both are given.
The chase card
The Mega Rayquaza ex Mega Ultra Rare, card 113, is the only card of its rarity in the set.
| Source | Metric | 31 July | Now | Change |
|---|---|---|---|---|
| Card Rush | buylist | ¥260,000 | ¥170,000 | −34.6% |
| Snkrdunk | transaction | ¥300,000 | ¥188,000 | −37.3% |
| Altema | retail | ¥348,000 | ¥238,000 | −31.6% |
Three sources, three metrics, and they agree on the shape: roughly a third gone in five days. You will see 46% quoted elsewhere. That figure is manufactured by taking the highest launch print from one shop and the lowest current buylist from another, and no single source supports it.
The split, which is the actual finding
Here is what makes this set interesting rather than just another correction.
The Mega Rayquaza ex Special Art Rare, card 110, went from ¥82,500 to ¥70,000. That is −15%, and Card Rush was still quoting ¥75,000 on 5 August. It is the second-rarest card in the set and it barely moved.
The Zinnia's Trust Special Art Rare, card 112, went from ¥10,000 to ¥3,300. That is −67%, the steepest fall in the set, and it sits at the same rarity as the Rayquaza that held.
The pattern repeats a tier down. Zinnia's Trust as a Super Rare fell from ¥850 to ¥400, and Pokémon Catcher from ¥125 to ¥75, while Aarune sat flat at ¥275 and Emcee's Hype flat at ¥300.
So rarity did not decide who fell. Subject did. The cards carrying Rayquaza held their price; the trainer and supporter cards at identical rarity did not. If you are deciding what to keep out of a box, that distinction is worth more than the rarity symbol.
Raikou ex at card 108 is the one we cannot pin down, and it is worth saying so. Snkrdunk's page for the card itself shows ¥9,999 falling to ¥7,150, about −29%. Snkrdunk's page for the set shows the same card launching at ¥17,000 and falling to ¥9,000, about −47%. Those are the same publisher contradicting itself, so treat any Raikou number you see with suspicion, including ours.
The box costs more than what is in it
Storm Emeralda's sealed box is ¥6,000 at retail: 30 packs at ¥200, five cards each.
It peaked at ¥36,000 on 7 July, three weeks before the set existed, on preorder speculation alone. It opened at ¥22,900 and trades at ¥21,400 today.
Which of those you quote decides what story you tell. From the speculative peak the box is down 40%. From launch day it is down 7%. Both are true and they describe different things, so it is worth saying which one you picked. We picked both.
The number that actually matters is neither. Japanese tracker pokeka-atari puts the expected value of the singles inside a box at ¥18,846, against a box trading between ¥19,000 and ¥21,400. At today's price you are paying at or slightly above what the contents are worth, which means the sealed premium has fully closed and then some. Ripping is a bet on variance, not on value.
Why this matters in September
30th Celebration lands on 16 September in a coordinated global release, and it introduces a brand-new top rarity, the Futuristic rare. The forecasts circulating for those cards run from ¥35,000 to ¥250,000, a seven-fold spread between guesses, and not one Japanese shop has published a real buylist price for any of them.
Storm Emeralda is the most recent evidence available about what happens next. A brand-new top-tier card lost a third of its value in five days. A sealed box that peaked three weeks before release gave back 40% of that peak. And the cards that held were the ones people actually wanted to look at, not the ones that were hardest to pull.
Its Western counterpart, Delta Reign, arrives on 6 November.
Prices are Japanese market data retrieved on 5 August 2026 from Card Rush, Snkrdunk, Altema, PRICE BASE and pokeka-atari, and move constantly. Every percentage is computed within a single source and a single metric, and buylist, retail and transaction figures are never blended. Card numbering follows the Japanese print.