Hello, this is PokeNinJapan!
On August 1st, the new Pokémon Card sets Mega Brave and Mega Symphonia will be released!
We'd like to introduce the currently available information about the contents of these two packs.
(The following details are taken from the official website.)

The packs feature Mega Lucario and Mega Gardevoir.
Both feature eye-catching designs with vivid blue and red for Mega Brave, and vibrant pink and yellow for Mega Symphonia.
This time, the packs feature Mega Evolution ex.
Let’s take a look at some of the cards included.
💡Mega Evolution ex rule💡
When your Mega Evolution Pokémon ex is Knocked Out, your opponent takes 3 Prize cards.
Mega Brave
Riolu / Mega Lucario ex
Riolu
▶Accelerating Stab:During your next turn, this Pokémon can’t use Accelerating Stab. 30 damage.
Mega Lucario ex
▶Aura Jab:Choose up to 3 Basic Fighting Energy cards from your discard pile and attach them to your Benched Pokémon in any way you like.
▶Mega Brave:During your next turn, this Pokémon can’t use Mega Brave.
Bulbasaur / Ivysaur / Mega Venusaur ex

Bulbasaur
▶Bind Down: During your opponent's next turn, the Defending Pokémon can't retreat. 10 damage.
Ivysaur
▶Razor Leaf: 60 damage.
Mega Venusaur ex
▶Ability: Solar Trans
As often as you like during your turn, you may move a Basic Grass Energy from 1 of your Pokémon to another of your Pokémon.
▶Jungle Dump: Heal 30 damage from this Pokémon. 240 damage.
Vulpix / Ninetales
Vulpix
▶Stampede: 10 damage.
▶Combustion: 20 damage.
Ninetales
▶Suspicious Shapeshifting: Discard the top card of your deck. If it’s a Supporter card, use the effect of that card as this attack’s effect.
▶Blaze: 60 damage.
Makuhita/Hariyama
Makuhita
▶Corkscrew Punch: 30 damage.
▶Confront: 30 damage.
Hariyama
▶Ability: Sumo Catcher
When you play this card from your hand to evolve one of your Pokémon during your turn, you may switch 1 of your opponent’s Benched Pokémon with their Active Pokémon.
▶Wild Press: 210 damage. This Pokémon does 70 damage to itself.
Mega Symphonia
Ralts / Kirlia / Mega Gardevoir ex
Ralts
▶Collect: Draw a card.
▶Headbutt: 10 damage.
Kirlia
▶Call Sign: Search your deck for up to 3 Pokémon, reveal them, and put them into your hand. Then, shuffle your deck.
▶Psyshot: 30 damage.
Mega Gardevoir ex
▶Overflowing Wishes:Attach 1 Basic Psychic Energy from your deck to each of your Benched Pokémon. Then, shuffle your deck.
Mega Symphonia:This attack does 50 damage for each Psychic Energy attached to all of your Pokémon.
Sobble / Drizzile / Inteleon
Sobble
▶Surprise Attack: Flip a coin. If tails, this attack does nothing. 30 damage.
Drizzile
▶Double Stab: Flip 2 coins. This attack does 30 damage for each heads. 30x damage.
Inteleon
▶Bring Down: Knock Out the Pokémon in play (excluding this Pokémon) that has the least remaining HP.
▶Water Shot: Discard an Energy from this Pokémon. 110 damage.
Mega Latias ex / Latios

Mega Latias ex
▶Strafe: You may switch this Pokémon with 1 of your Benched Pokémon. 40 damage.
▶Mirage Pulse: Discard all Energy from this Pokémon. 300 damage.
Latios
▶Ability: Luster Assist
Once during your turn, when your Mega Latias ex moves from your Bench to the Active Spot, you may move any number of Energy from your Benched Pokémon to that Pokémon.
▶Dragon Claw: 130 damage.
Pachirisu

▶Tingly Incisors: During your opponent's next turn, whenever your opponent attaches an Energy from their hand to the Defending Pokémon, put 8 damage counters on that Pokémon. 10 damage.
👤Supporter cards that play an active role in the Pokémon Card Game MEGA series are also included!
Lillie’s Determination
▶Return your hand to your deck, then draw up to 8 cards. This powerful supporter helps you set up your early game strategy.
*Included in Mega Brave.
Wally's Compassion
▶Fully heal 1 of your Mega Evolution Pokémon ex. This card is a must-have for any deck using Mega Evolution ex.
*Included in Mega Symphonia.
The set also features Super Rare (SR) Item cards!
Night Stretcher
Choose 1 Pokémon or Basic Energy card from your discard pile and add it to your hand. This versatile Item card is useful in any deck.
*Included in Mega Brave.
Rare Candy
Choose a Stage 2 Pokémon from your hand and evolve it directly by skipping the Stage 1 evolution. This card is essential for decks using Stage 2 Pokémon.*Included in Mega Symphonia.
🥊 Premium Trainer Box MEGA Will Also Be Released!

Alongside the new expansions, the Premium Trainer Box MEGA will also be released!
This special box includes:
・10 packs of Mega Brave
・10 packs of Mega Symphonia
・172 cards (51 unique types)/13 Pokémon/59 Trainer cards/4 Special Energy/96 Basic Energy
・1 card storage box
・1 Pokémon coin
・1 set of acrylic damage counters/6 × 100 damage counters/8 × 50 damage counters/20 × 10 damage counters
・1 damage counter case
・Premium markers (1 Poisoned, 1 Burned)
※Each pack contains 5 randomly selected cards.
※Some cards included in this product are reprints from the Pokémon Card Game: Scarlet & Violet series.
Product page:
Pre-order{MA-Premium Trainer Box} Premium Trainer Box MEGA | Japanese Pokemon Card
BOX & CASE Product page
<BOX>
Pre-order{M1L Box} Mega Brave | Japanese Pokemon Card
Pre-order{M1S Box} Mega Symphonia | Japanese Pokemon Card
<CASE>
Pre-order{M1L Case} Mega Brave | Japanese Pokemon Card
Pre-order{M1S Case} Mega Symphonia | Japanese Pokemon Card
The release is less than a month away—can’t wait!
Thanks for reading!