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The raw data displayes the following ratios of secret rares / (full arts + secret rares): 53.5% (data compiled by me), 55.4% (data from @burpies) and 56.4% (data from Derium video)

What makes them essential is the Psy Shadow ability, which lets you take a Psychic Energy and attach it to the Psychic Pokemon in the Active Spot

Then regarding Spanish cards, they are printed in the US and The Netherlands (so made by Millenium Print Group and Millenium Print Group Europe), so you are right that they are not printed in Belgium by presumably Cartamundi and thus wont have those filler cards

After mastering a starter deck, expand your collection with booster packs, structure decks, or individual cards that enhance your strategy