I know I'm probably not the first to say this, but Stored Power is a move basically tailor-made for the new Espeon. In a Baton Pass team it will OHKO everything in the game that's not Dark-type, and outside of one it still synergizes amazingly with Magic Bounce and Calm Mind. The only problem is that it's kind of an all or nothing move, since Espeon's general frailty, especially physically, gives a pretty big weak point to hit during Espeon's all too obvious set-up, but it and psyshock are the only notable moves that Espeon gets anyway and Espeon has some obvious advantages over the few other users of this poorly distributed move, including Baton Pass, great initial Speed and Special Attack, and immunity to most phazing (all forms if he has sub). I guess the big advantage Sigilyph has over Espeon is he can used Cosmic Power to prolong his set-up and get more boosts but outside of their psychic typing and use of Stored Power the two couldn't be anymore different. Though now that I see Clefable gets Stored Power I kinda wanna try out some crazy novelty sets, on a totally unrelated note.
Edit: Oh whoa and five years later somehow I've "wasted" my 100th post here. Makes me almost nostalgic for when i was young with too much time on my hands on Pokemon forums and I'd do 100 posts in a day. Well, keep on giving me this relevant irrelevant info smogon, I am less than three of you guys.