They are usually themed, such as The Brothers' War containing only artifacts, or Wilds of Eldraine's bonus sheet only having enchantments
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Coin made in China
In this case, Mewtwo teams up with Mew, which according to the lore of the Pokmon world, should be quite unusual
These are "blank cards that in the Pokmon TCG are found in preconstructed decks or ETB energy bricks." Designed to be thrown away during production, their inclusion in boxes is a simple mistake that led the collector to a very interesting challenge: "[Collecting] one example of every weird thing that has ever come from the factories has been my goal since." According to Regigigagod, this is likely to be a never-ending quest
1 Jugan Defends the Temple