The Pokémon TCG: Scarlet & Violet - Stellar Crown 3-pack blister contains three booster packs from the Stellar Crown expansion, a special foil promo card (like Tinkaton or Latias), and often includes a coin and a code card for Pokémon TCG Live. It provides a way to get new cards from the set, which introduces Stellar Tera Pokémon ex and ACE SPEC cards, to expand a player's collection or deck. 
Contents
Three booster packs: From the Scarlet & Violet—Stellar Crown expansion.
A special foil promo card: This is often either Tinkaton or Latias. 
A coin: Sometimes included with the blister pack. 
A code card: For use in the online Pokémon TCG Live game. 
About the expansion
New Pokémon: Features new Pokémon ex, including Cinderace ex, Lapras ex, Galvantula ex, and the Legendary Terapagos. 
Terastal phenomenon: Introduces new Stellar Tera Pokémon ex and other cards related to the Terastal phenomenon. 
ACE SPEC cards: Includes powerful ACE SPEC cards that can change the game