Japanese Storm Emeralda (M6): prices, chase cards and box guide

The short version

Storm Emeralda, set code M6, is a Japanese MEGA expansion released on July 31, 2026, and as of mid-September 2026 most of its listed value sits in one Pokémon. Mega Rayquaza ex #113, the Mega Ultra Rare, is about $946 on the US market. One copy of every entry on the set page costs about $1,680, so that single card is about 56 percent of the total. Add the Special Art Rare #110 at about $373 and two cards hold about 78 percent.

The booster box is about $117 for 30 packs of 5 cards, and a loose pack is about $3.52. This site holds no pull-rate data for Japanese sets and calculates no expected value for Japanese sealed product, so nothing here says what a box returns on average. Bulbapedia names Delta Reign as the English set for these cards, and it does not release until November 6, 2026, so there is no English price to compare yet.

What Storm Emeralda is

The official product page calls it MEGA Expansion Pack "Storm Emeralda" and gives a release date of Friday, July 31, 2026, a price of 200 yen per pack including tax, and 5 cards per pack, inserted at random. It lists no box price and no box contents. Bulbapedia's set page supplies the box: 30 packs, so 150 cards. Thirty packs at the official pack price comes to 6,000 yen, which is arithmetic and not a published box price.

The numbered set is 76 cards. Above it sit 37 secret cards, for 113 in all: 12 Art Rares (077 to 088), 18 Super Rares (089 to 106), 6 Special Art Rares (107 to 112) and one Mega Ultra Rare, Mega Rayquaza ex #113. Mega Ultra Rare is the tier English calls Mega Hyper Rare.

The set's new idea is a Stadium played as a pair: the official page describes Stadium cards used as a set of two, and Bulbapedia describes one artwork split across two cards. There are three pairs, all Uncommon, numbered 071 to 076. The set page shows 116 entries, not 113. TCGplayer lists each half on its own and each pair again as one entry, such as Legendary Lava Tube [Set of 2], and those three pair listings are the difference.

On the English side, Bulbapedia's Storm Emeralda page names Delta Reign as the expansion for these cards, worded as an expectation, and its Delta Reign page states that the set includes cards released in Storm Emeralda. The official announcement, dated August 20, 2026, puts that release on November 6, 2026, fourteen weeks after Japan, and names Mega Rayquaza ex, Mega Golurk ex, Mega Malamar ex and Mega Golisopod ex without mentioning any Japanese set. It promises more than 135 cards against 113 here, and we did not confirm where the extra cards come from.

The numbers

The block below pulls the current figures from the set page. Each is the US TCGplayer market price of the Japanese printing, meaning what US sellers have recently sold it for. None is a price in Japan.

As of mid-September 2026 the median entry is worth about 39 cents. Only 11 of the 116 entries clear $10 and only 3 clear $50. One of everything at market is about $1,680, and the total splits like this:

• Mega Rayquaza ex #113 alone: about $946, or 56 percent.
• #113 plus #110: about $1,318, or 78 percent. Everything else adds up to about $362.
• All four Mega Rayquaza ex printings, from the Double Rare #58 at about $2.31 up to #113: about $1,361, or 81 percent.
• The 15 most valuable cards: about $1,581, or 94 percent. The other 101 entries together come to about $100.

The tiers show the same drop. The 6 Special Art Rares average about $86, but without Mega Rayquaza ex the other five average about $29. The 18 Super Rares average about $6.30, the 12 Art Rares about $6.51 and the 8 Double Rares, the regular ex cards, 78 cents. The 79 Common, Uncommon, Rare and Double Rare entries add up to about $27.

Chase cards

The table below shows the set's eight most valuable cards at today's prices.

Mega Rayquaza ex #113 at about $946 is roughly 2.5 times the Special Art Rare #110 at about $373, and nearly 13 times the third card, Raikou ex #108, a Special Art Rare at about $74. The Super Rare Mega Rayquaza ex #95 is fourth at about $40, so three of the top four are the same Pokémon. Zinnia's Trust #112, a Special Art Rare Trainer card, is fifth at about $31.

After that the prices bunch together. Kyogre #80, an Art Rare, is about $15.17, Mega Golisopod ex #107 about $14.75, Kecleon #88 about $14.44 and Mega Golurk ex #109 about $14.33. Three of the six Special Art Rares (Mega Golisopod ex, Mega Golurk ex and Aarune #111 at about $9.38) cost less than the Kyogre Art Rare, so rarity letters alone do not rank the cards.

Neither the official page nor Bulbapedia gives odds for any rarity, and this site has none. Per box estimates circulate on shop blogs, but we found none backed by a published dataset, so none is repeated here. The set is also young: it was seven weeks old in mid-September 2026, and this site's price history for it starts on September 18, 2026, so there is no long record behind these numbers.

Japanese versus English prices

There is no comparison to make yet, and this guide does not guess at one. Going by Bulbapedia, the English counterpart is Delta Reign, which does not release until November 6, 2026, so as of mid-September 2026 we have no English price to put beside the Japanese one. The 2026 English sets this site already prices, such as Pitch Black and Chaos Rising, have no Mega Rayquaza ex among their top cards.

Once Delta Reign is out, a fair comparison matches cards by name and artwork role: Mega Ultra Rare against Mega Hyper Rare, Special Art Rare against Special Illustration Rare, Art Rare against Illustration Rare. Even then the two are separate markets, as Japanese versus English cards explains.

Sealed product

The booster box is about $117 as of mid-September 2026. At Bulbapedia's 30 packs that is about $3.89 a pack, against about $3.52 for a loose pack. Thirty loose packs would cost about $106, so the sealed box carries a premium of about $11 over the same number of loose packs.

What a box holds, going by the sources: 30 packs of 5 cards, inserted at random. What it guarantees beyond that: nothing we could confirm. The official page promises no rarity per box, Bulbapedia states none, and we found no good source reporting a box pattern for this set. The sealed EV board covers English products only, and its pull rates were measured on English packs, so it says nothing about this box.

A missing shrink wrap tells you little about a Japanese box. As our resealed product guide explains, Screen Rant reported in March 2025 that Pokémon Center stores in Japan take the plastic wrap off booster boxes at the point of sale, so an unwrapped box is not evidence of tampering by itself. It also means there is no outer seal to check, so the seller's record matters more. Importers' rule of thumb is that many Japanese boxes open through a cardboard tear strip that cannot be put back, which makes a clear photo of the strip a reasonable thing to ask for.

How to buy it

Any Storm Emeralda card or product page gives you the US market price for the Japanese printing, its price history, the figure that is 12 percent under market, and a pair of eBay buttons. Each button runs eBay's own search for Buy It Now listings from US sellers with Japanese, JPN or JP in the title, with proxies, lots and other languages excluded, sorted by price plus shipping. The first button caps the item price at 12 percent below market and the second shows everything. They are affiliate links. The block below does the same for the booster box and the booster pack, with the cap already applied.

The cap works on the item price, so shipping is yours to add. Under the methodology a listing counts as below market only when its landed price, item plus shipping, is at least 12 percent under market: about $103 delivered for the box. A single pack at about $3.52 sits under the $5 market floor the method uses, so the method does not score it, and shipping decides what a pack really costs. If a capped search comes back empty, nothing is listed below market at that moment. The second button shows every current price, and eBay's "Save this search" gets you an email when new matches appear.

The buttons only return US sellers, so nothing found through them crosses a border. Widen the search to sellers in Japan and a shipment of any value can pick up import charges, so look for that line on the item page or at eBay checkout and add it to the landed price.

For singles, every price here is for a raw Near Mint copy, and a Lightly Played copy is measured against 85 percent of market. A Near Mint Mega Rayquaza ex #110 has to land near $328 to count as below market, and a Lightly Played one near $279. For #113 the Near Mint line is about $832. eBay's Authenticity Guarantee covers trading cards sold for $200 or more in the US, which at these raw prices means those two cards and no others in this set, and it does not cover boxes or packs. Bulbapedia dates releases of the same set in Taiwan, Hong Kong and South Korea to August 2026, so confirm the language from photos of the front and back, and read how to spot fake cards before paying three figures for a single.

Who it suits

• Rayquaza collectors. Four printings of Mega Rayquaza ex carry about 81 percent of the set's listed value.
• People who want to open a current Japanese box for the fun of it. About $117 buys 30 packs and 150 cards, with no promise about what is inside.
• Anyone after one card is looking at the singles market. Only 11 entries cost more than $10, and no box guarantees any of them.
• Completists have an unusual set in front of them: about $362 covers all but two cards.
• Tournament players get nothing from it. Japanese cards cannot be used at US Championship Series events.

Bottom line

Storm Emeralda (M6) is a 113 card Japanese set, released July 31, 2026, sold in 30 pack boxes of 5 card packs. As of mid-September 2026 a box is about $117 and a loose pack about $3.52. One card, the Mega Ultra Rare Mega Rayquaza ex at about $946, is 56 percent of the set's listed value, and two cards are 78 percent. No expected value exists for the box, no source we found states a box guarantee, and Delta Reign is not out until November 6, 2026, so there is no English price to compare. Start from the set page or the Japanese index, and measure any landed price against the Japanese market price, never an English one.