The Stellar Crown booster pack is part of the Pokémon TCG: Scarlet & Violet expansion and includes cards from the Hidden Treasure of Area Zero DLC. These packs let you discover new Pokémon ex, such as the Legendary Terapagos, Cinderace ex, and Hydrapple ex,as well as new ACE SPEC cards. Each pack typically contains 10 cards, a basic energy card, and a Pokémon TCG Live code card. 
Key features
New Pokémon: 
Features include the Legendary Terapagos and other powerful Pokémon ex like Cinderace ex, Lapras ex, Galvantula ex, and the newly discovered Hydrapple ex. 
ACE SPEC cards: 
The expansion introduces ACE SPEC cards, which can significantly change gameplay. 
Terastal phenomenon: 
Players can explore the Terastal phenomenon with Pokémon like Stellar Tera Pokémon ex. 
New Trainer cards: 
Discover new supporter cards such as Briar, Crispin, Kofu, and Lacey. 
Content: 
Each pack contains 10 cards and one basic energy card. Sleeved booster packs also include a Pokémon TCG Live code card. 
Artwork: 
The set also includes unique artwork, such as illustration rares and gold cards.