Mega Symphonia Booster Box Japanese M1S | Mega Gardevoir ex

The Mega Symphonia booster box marks the beginning of the Pokémon TCG’s new MEGA era, bringing Mega Evolution back to the Japanese card game. Japanese M1S launched on August 1, 2025, alongside Mega Brave, with the two expansions introducing a new generation of Mega Evolution Pokémon ex cards. The official Pokémon Card Game website confirms that Mega Symphonia packs contain 5 randomly inserted cards and released in Japan on August 1, 2025.

Official Pokémon Card Game — Mega Symphonia

The Return of Mega Evolution

Mega Symphonia isn’t simply another Scarlet & Violet expansion. It belongs to the Pokémon Card Game MEGA series, making it one of the products that launched the return of Mega Evolution to the Pokémon TCG.

The set’s central Pokémon is Mega Gardevoir ex, while other Mega Pokémon appear throughout the collection. The official Japanese card information identifies Mega Symphonia as part of the MEGA expansion series.

For collectors, this makes M1S an important historical product: it is one of the Japanese booster boxes that introduced the new Mega Evolution era.

Mega Gardevoir ex Leads the Set

The headline Pokémon of M1S Mega Symphonia is Mega Gardevoir ex.

Gardevoir has been a popular Pokémon among collectors for years, and its Mega Evolution gives the set a natural centerpiece. The official Pokémon card database lists Mega Gardevoir ex as a Stage 2 Pokémon ex with 360 HP, making it one of the prominent Mega Pokémon from the expansion.

The card also introduces a distinctive Psychic-focused strategy built around attaching Psychic Energy to your Pokémon.

Official Pokémon Card Database — Mega Gardevoir ex

More Mega Pokémon to Collect

Mega Gardevoir isn’t the only reason to open M1S.

The expansion also features Pokémon such as:

• Mega Latias ex

• Mega Kangaskhan ex

• Mega Manectric ex

• Mega Abomasnow ex

• Mega Gardevoir ex

This mixture gives the set a broad selection of Mega Evolution cards rather than concentrating entirely on one Pokémon.

For collectors, the different Mega Pokémon also make M1S a useful starting point for building a Japanese Mega Evolution collection.

A New Era for Japanese Pokémon Cards

The launch of Mega Symphonia and Mega Brave represented a significant change for the Pokémon TCG.

The MEGA series brought Mega Evolution Pokémon back into modern Pokémon cards after the mechanic had been absent from the main TCG for several years.

That makes a sealed M1S Mega Symphonia booster box more than simply another Japanese display. It represents one of the original products from the beginning of the modern MEGA era.

30 Japanese Booster Packs

Each sealed M1S display contains:

• 30 Japanese booster packs

• 5 cards per pack

• 150 cards per booster box

The official Japanese Pokémon Card Game product information confirms the five-card configuration and explains that cards are inserted randomly.

Because the contents are randomized, opening a box does not guarantee Mega Gardevoir ex, Mega Latias ex, a particular illustration card, or any other individual rarity.

M1S Card Pool

Mega Symphonia contains 63 cards in its numbered main set, with additional secret-rarity cards bringing the total collectible card pool to 92 cards.

This gives collectors a mixture of regular Pokémon, Mega Evolution ex cards and higher-rarity versions to pursue.

The set’s lineup includes both modern Mega Pokémon and familiar favorites, giving the expansion a mixture of nostalgia and the newer visual style of the MEGA series.

Mega Symphonia and Mega Brave

M1S was released together with M1L Mega Brave.

The two expansions form the opening Japanese pair of the MEGA era, making them natural companion products for collectors who want to experience the beginning of the new series.

The official Pokémon Card Game website lists both Mega Brave and Mega Symphonia as Pokémon Card Game MEGA expansion packs released on the same date.

Japanese Factory-Sealed Product

This listing is for a Japanese M1S Mega Symphonia booster box.

Each display is:

• Japanese-language

• Factory sealed

• 30 booster packs

• 5 cards per pack

• Part of the Pokémon Card Game MEGA series

The Japanese release date was August 1, 2025, and the official Japanese pack MSRP was ¥180 per pack.

Why Collect Mega Symphonia?

For collectors, M1S has a particular advantage: it represents the beginning of the modern Mega Evolution era.

Mega Gardevoir ex provides the set’s signature Pokémon, while Mega Latias ex, Mega Kangaskhan ex, Mega Manectric ex and other Mega Pokémon expand the chase list.

Whether you are collecting Japanese Pokémon booster boxes, building a Mega Evolution collection, or simply looking for sealed products from the beginning of the MEGA series, Mega Symphonia M1S is an important Japanese release.