Once youve gone through the entire show, circle back to the cards you noted
In short, you can almost always assume that a Pokmon Booster Pack will contain 10 cards, plus extras like an energy and code card
While Muks Retreat Cost may be three, it can bypass this due to its compatibility with Koga which can bounce it back to the hand as well as any attached Grimer
SR Super Rare Box of Friends X LIGHT Level 1 [ MachineEffect ] ATK 0 DEF 0 If this card is destroyed and sent to the GY: You can Special Summon 2 Normal Monsters with 0 ATK or DEF and different names from your Deck in Defense Position, but they cannot be used as Synchro Material, also they are destroyed during your next End Phase
[2] It was released on April 17, 2020, in Asia and on May 15, 2020, in the rest of the world