Mainly asking this cause I'm considering making a team out of this core...
"This core is operates by sleeping one of their important checks to mewtwo or arceus and then sweeping. Darkrai comes out late game after they revenge kill one of your other offensive threats. If you're against stall you agressively substitute with Darkrai forcing them to let you sleep an important pokemon without relying on risky predictions. I usually support this core with a weather inducer, a stealth rocker, and a ghost for a really basic offensive team that doesn't worry about team match-ups because Darkrai throws any advantages they have out the window."
Interesting core. But just out of curiosity, what should happen if your own darkrai is put to sleep by an opposing darkrai/ flinched to death by shaymin/ ko'd by mewtwo?
"There Is No Good, There Is No Bad. Just Perspective and Opinion"