After counting your Prize cards, shuffle them into your deck. Then, take that many cards from the top of your deck and put them face down as your Prize cards.
You may play as many Item cards as you like during your turn (before your attack).

Rotom Dex
Sun & Moon 159 · Trainer · Item
StandardNot legal
Regulation marknone
RarityRare Secret
Standard uses regulation marks H and later, plus identical reprints of legal cards.
Released February 3, 2017.
Other printings with the same text
Buy this card: TCGplayer · eBay · Cardmarket (EU)
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Build with this card
The Pokémon deck builder checks every deck against the Standard rules, and Genny can build one around Rotom Dex.
Open the deck builder