Rianti Hidayat has illustrated 9 Pokémon cards across 8 sets, from 2019 to 2026. The most valuable is Bouffalant ex at around $16.70.
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Their earliest card is Galarian Zapdos from SWSH Black Star Promos, and the most recent is Pikachu from 30th Celebration. They have drawn Haunter more than any other Pokémon (2 cards), followed by Bouffalant and Zapdos. One of them, Bouffalant ex, is a special rare, the kind collectors chase most.