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I eventually found other Piplup collectors with their collections on Reddit and @citriina 's here on e4

Pokmon Trading Card Game Pocket, announced in February and out in late October, whittles the Pokmon franchise down to its simplest form: collection

By this point, a wider range of effect monsters, spell and trap cards had been introduced over the course of the previous six booster packs to offer a more expansive card pool, combined with the removal of rules restricting the use of spell and trap cards to just a single card per turn

We often see collections like this come out in the next era as a way for The Pokemon Company to clear any leftover stock of the old expansions

the ATK of the first target becomes equal to the original ATK of the second target, until the end of this turn