I played 3 WPs in my Empo/Sableye States deck, I ran into G/G, with a GREAT outcome! I Started with Sableye and Piplup on the bench and a Water, Switch, a WP in my hand! I started with Sableye Disabled his sleep, next turn he RC to Gallade DRE, Sonic blade. Sent me to the bench. Next turn I attached the WP to Sableye, SWITCHED, and Diabled Psychic CUT! He Could NOT attack me for 3 Turns, So BY that time I had 2 Empos built with Energy on 1. He had to retreat Gallade, for another anothetr Gallade, for him to Psychic CUT. I ran Cessation Cryusatal, so Gardy wasnt needed, I had WPs on both Empos, so that HELPED me beat that G/G deck! By the way, that G/G player went 5-1 in Swiss rounds, ONLY losing to me in the 3rd round, so...Empo is STILL a BEAST to be Reckoned with!!! My NEW Empo deck is more improved and possibly better than that one.
So, go with ATLEAST 3 WPs when running Empo!!!