Fuchsia City Gym (Gym Challenge 114/132)

Once during each player's turn (before attacking), that player may flip a coin. If heads, that player may shuffle 1 of his or her Pokémon in play with Koga in its name and any cards attached to it into his or her deck.

Card rule

This card stays in play after being played. Discard this card if another Stadium card comes into play.