A Pokemon Inferno X booster box is a Japanese-language product containing 30 packs, each with 5 cards, for a total of 150 cards. The set is focused on fire-type and Mega Evolution-themed Pokémon, with the main chase cards being the gold and special illustration rare versions of Mega Charizard X ex. Each box is guaranteed to have at least one secret rare card and other desirable pulls like Art Rares and Super Rares. 
Box contents and features
Total cards: 150 cards (30 packs x 5 cards per pack)
Language: Japanese
Release Date: September 26, 2025
Set focus: Fire-type Pokémon, Mega Evolution theme, and specifically includes Mega Charizard X ex 
Key chase cards
Mega Charizard X ex (Gold Rare): A highly sought-after card
Mega Charizard X ex (Special Illustration Rare): Another major chase card
Other valuable cards: The set also features other desirable cards, including the Oricorio ex (Shiny card), Dawn trainer (Special Illustration Rare), and other Super Rares and Art Rares 
Pull rate guarantees
Each booster box guarantees at least one Secret Rare, which can be a Special Art Rare or a gold card.
Boxes typically include a variety of rare cards, such as Art Rares, Super Rares, and Double Rares.
Note: The specific pull rates may vary between boxes. 
Related information
The Inferno X set is scheduled to be released in English under the name Fantasmal Flames, with some card differences.
The set code is M1a.