Well, Mimikyu's Impersonation attack pretty much lets you do just that
Cats Healing Undead Vampires Pirates Wizards Inferno Goblins Primal Elves If you are looking for specifics on what cards are in each list, visit this link
Theres no definitive proof for keeping/removing them
Inside a Collector Chest, youll find: five booster packs (these will be from recently released sets, but the exact quantity of each booster pack type is not guaranteed, so for example you may have 2 Shrouded Fable packs, 1 Temporal Forces and 2 Paldean Fates, though this wouldnt necessarily be the case for another tin of the same type), foil cards featuring the Pokemon shown on the tin (these will be the same for each tin of the same type), a Pokemon coin, 4 sticker sheets, a mini portfolio binder for storing a small number of cards, a notebook and, finally, a code card to unlock cards on the digital version of the Pokemon TCG, Pokemon Live