Here is what we know from The Pokemon Company directly and how it could work based off some of the other systems in the game right now
Stitch your eyes, stitch your skin, stitch your mouth into a grin. Illustrated by Riccardo Federici Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Ready to grade your first card
Friends on the Other Side will draw you four cards, Let the Storm Rage On will deal four damage and draw two cards, The Bear Necessities will force your opponent to discard two cards: the possibilities are endless
Next, remove the security card and open the package
For example, if you collect a Venusaur ex from Genetic Apex , the game will unlock the Venusaur ex Deck for you to rent