PMJ is correct. In addition to affecting all Pokemon in play, there is one important exception to Strong Winds' effect, and and that is what happnes to the Team Flare tools Jamming Next and Head Ringer when the attack is used. These cards specifically state "when this card are removed from a Pokemon for any reason, put this card in its owner's discard pile." So, any Jamming Nets and Head Ringers in play when Strong Winds is used would be discarded rather than suhuffled into their owners' decks.