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Perhaps they are drifting above Pallet Town where Ash famously ran afoul of those very same Pokemon

Almost certainly bulk

2024-02-02 The pile is shuffled to disguise from your opponents which cloaked creature is which

(2013-06-07) If a creature with persist that has +1/+1 counters on it receives enough -1/-1 counters to cause it to be destroyed by lethal damage or put into its owner's graveyard for having 0 or less toughness, persist won't trigger and the card won't return to the battlefield

In other words, if you have 2 Zefra Providence in your hand you can only use 1 of them to add per turn, but if you have 2 of them in the GY, you can use both of them on the same turn to protect your Zefra cards