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Monster Effect Once per turn, when exactly 1 other Pendulum Monster you control (and no other cards) is returned to your hand by an opponent's card effect (except during the Damage Step): You can Special Summon 1 monster from your hand with the same name as that returned to the hand

This is pretty consistent among all Pokemon cards

But doing so makes for a worse opening experience, which is part of the whole appeal of TCGs

Additionally, plans can always change before release if the developers change their minds , so players shouldnt rely on leaked release schedules before any official announcements have been made

These cards can be given out to commemorate special events like movie releases or store openings