Storm Emeralda Booster Box Japanese M6 | Mega Rayquaza ex

The Storm Emeralda booster box is the Japanese M6 expansion from the Pokémon Card Game MEGA series, released in Japan on July 31, 2026. Centered around Mega Rayquaza ex, this expansion brings the legendary Pokémon into the modern Mega Evolution era while introducing a new paired Stadium-card mechanic. The official Pokémon Card Game confirms that each Japanese booster pack contains 5 randomly inserted cards, with 30 packs in each box.

Official Pokémon Card Game — Storm Emeralda: View the official M6 product information

Mega Rayquaza ex Leads Storm Emeralda

The centerpiece of M6 Storm Emeralda is Mega Rayquaza ex.

The official Pokémon Card Game database lists Mega Rayquaza ex as M6 058/076, with 280 HP. Its Storm Emeralda attack deals 50 damage multiplied by the number of Fire and Lightning Energy attached across your Pokémon in play.

The attack also explains the expansion’s name and reinforces the set’s strong connection to Rayquaza’s powerful Emerald-era identity.

A Major Mega Rayquaza Release

Storm Emeralda is the sixth Japanese expansion of the modern Mega Evolution series and puts Mega Rayquaza at the center of the product rather than simply featuring it as one Pokémon among many.

The expansion draws heavily from the world surrounding Pokémon Omega Ruby and Alpha Sapphire, while still incorporating Mega Evolution Pokémon connected with the wider modern MEGA era.

For Rayquaza collectors, this makes the Japanese M6 booster box particularly significant.

More Mega Pokémon to Collect

Mega Rayquaza ex isn’t the only Mega Evolution in M6.

The set includes several other Mega Evolution Pokémon, including:

• Mega Rayquaza ex

• Mega Golisopod ex

• Mega Malamar ex

• Mega Golurk ex

Other Pokémon ex and Holo Rare cards expand the set beyond its four Mega Evolution headliners.

This gives collectors a mixture of legendary Pokémon, popular characters and new Mega Evolution cards to chase.

Mega Rayquaza ex High-Rarity Cards

Mega Rayquaza ex appears across multiple rarities in Storm Emeralda.

Collectors can pursue:

• Mega Rayquaza ex SR

• Mega Rayquaza ex SAR

• Mega Rayquaza ex MUR

The Mega Rayquaza ex MUR is the final numbered card in the Japanese checklist, while the SAR provides a premium illustrated version of the set’s signature Pokémon.

This makes Mega Rayquaza the natural centerpiece for collectors opening M6 or building a complete Storm Emeralda card collection.

Paired Stadium Cards — A New Mechanic

One of the most distinctive features of Storm Emeralda is its new paired Stadium card mechanic.

Instead of one Stadium card forming the entire artwork, certain Stadiums are divided across two separate cards. The two halves are played together to create the complete Stadium effect.

This gives M6 a collecting feature that is visually and mechanically different from earlier Japanese Mega Evolution expansions.

Pokémon and Characters From Hoenn

Storm Emeralda has a strong Hoenn influence.

The expansion draws inspiration from Pokémon Omega Ruby and Alpha Sapphire, with Mega Rayquaza serving as the central Pokémon. This creates a different atmosphere from M5 Abyss Eye, which focused more heavily on the Mega Evolution content associated with Pokémon Legends: Z-A.

For collectors who enjoy Hoenn Pokémon and Mega Evolution, M6 offers a particularly relevant Japanese release.

76-Card Main Set

The Japanese Storm Emeralda main set contains 76 cards.

The complete Japanese checklist extends into the higher-rarity cards, reaching 113 numbered cards in the current complete card list.

The higher-rarity section includes:

• 11 Art Rare cards

• 12 Super Rare cards

• 6 Special Art Rare cards

• 1 Mega Ultra Rare

The complete list gives collectors a substantial range of cards to pursue beyond the regular 76-card expansion.

30 Japanese Booster Packs

A sealed M6 Storm Emeralda booster box contains:

• 30 Japanese booster packs

• 5 cards per pack

• 150 cards per box

The official Pokémon Center Online listing confirms the 30-pack box format, with five cards per booster pack and random insertion.

Because the cards are randomly inserted, a sealed box does not guarantee Mega Rayquaza ex, the SAR, MUR or any other specific card.

Japanese Release

Storm Emeralda officially released in Japan on July 31, 2026.

The official Pokémon Center Online listing gives the Japanese retail price as ¥6,000 per box, while the official Pokémon Card Game product information lists the booster pack MSRP at ¥200.

The product is the original Japanese M6 release and is currently the Japanese version of this expansion.

Japanese Factory-Sealed Product

This listing is for a Japanese M6 Storm Emeralda booster box.

The product is:

• Japanese-language Pokémon TCG

• M6 expansion

• Factory sealed

• 30 booster packs

• 5 cards per pack

• 150 cards per box

• Part of the Pokémon Card Game MEGA series

The official Pokémon Center Online listing confirms that the product is made in Japan and gives the physical box specifications.

Why Collect Storm Emeralda?

Storm Emeralda M6 is especially appealing to collectors because it combines one of Pokémon’s most recognizable Legendary Pokémon with the continuing Mega Evolution era.

Mega Rayquaza ex is the headline chase, while Mega Golisopod ex, Mega Malamar ex and Mega Golurk ex provide additional Mega Evolution targets. The paired Stadium cards also give M6 a unique mechanic and visual identity.

For collectors building a Japanese Mega Evolution booster box collection, M6 Storm Emeralda is an important 2026 release and a standout Japanese Mega Rayquaza product.