People talking about switching Darkrai in...can't you just start it? Save your Dark Void for the counter, and just own whatever happens to be standing in front of you. It doesn't have to come in too many times. Besides, it's almost inevitable that you'll lose a Pokemon (or win anyways). Feel free to bring in Darkrai to receive some vengeance.
OU Pokemon faster or equal speed to Darkrai:
Deoxys-S: Don't know much about this guy, so I can't say much. I do remember that Deoxys-S can run Superpower, though.
Ninjask: Why are you still here again?
Jolteon: I'm not sure if this guy is still OU, but then again, what can Jolteon even do to you? Thunderbolt you? I don't think that will deal a whole ton of damage to you, honestly. Own face with one of your various special attacks.
Weavile: I can only imagine that you switch out in the face of a Brick Break, since Pursuit won't be dealing very much damage to you on a switch out anyways. Besides the fact that Weavile doesn't have a whole lot it can do to you besides Brick Break. Or, if you're bored, you could just attempt to be really lucky and drop a Dark Void or Focus Blast from the sky.
BL Pokemon faster or equal speed to Darkrai:
Aerodactyl: Probably a switch-out. Aerodactyl can deal a good amount of damage with a STAB Stone Edge/Rock Slide on a Choice Band. Most builds are like that, anyways. On the other hand, if that move won't KO you (not good at math or damage calculators), then Ice Beam/Thunderbolt away.
Crobat: This guy does one thing well: Hypnosis. So, switch to some other thing.
Stuff with Choice Scarf will probably be really obvious. Like, "Why is this Heracross switching in to my Darkrai?" or something like that. Either that, or the "stuff with Choice Scarf" won't deal enough damage to be worthy of your worry.
Honestly, I really want to know why anyone feels that we need to include Darkrai in the current OU. We already know it will be good, considering how many comparisons to Gengar are going around. The two Pokemon are fairly similar, and if that means anything, it means Darkrai will be at or around Gengar level power at worst. Do we need Darkrai in OU? Is there some special reason that it should be included? Because as far as I know, it's serving its purpose quite well in the land of Ubers.
Edit: Banned in Battle Tower means nothing, by the way. Considering they banned Jirachi and Celebi, I think they probably banned the main Legendary Pokemon from every game (Mewtwo, Lugia, Ho-Oh, Kyogre, Groudon, Rayquaza, Palkia, and Dialga), then banned every event-only Pokemon (Mew, Celebi, Jirachi, Manaphy (and Phione), Darkrai, Shaymin, Arceus).
OU Pokemon faster or equal speed to Darkrai:
Deoxys-S: Don't know much about this guy, so I can't say much. I do remember that Deoxys-S can run Superpower, though.
Ninjask: Why are you still here again?
Jolteon: I'm not sure if this guy is still OU, but then again, what can Jolteon even do to you? Thunderbolt you? I don't think that will deal a whole ton of damage to you, honestly. Own face with one of your various special attacks.
Weavile: I can only imagine that you switch out in the face of a Brick Break, since Pursuit won't be dealing very much damage to you on a switch out anyways. Besides the fact that Weavile doesn't have a whole lot it can do to you besides Brick Break. Or, if you're bored, you could just attempt to be really lucky and drop a Dark Void or Focus Blast from the sky.
BL Pokemon faster or equal speed to Darkrai:
Aerodactyl: Probably a switch-out. Aerodactyl can deal a good amount of damage with a STAB Stone Edge/Rock Slide on a Choice Band. Most builds are like that, anyways. On the other hand, if that move won't KO you (not good at math or damage calculators), then Ice Beam/Thunderbolt away.
Crobat: This guy does one thing well: Hypnosis. So, switch to some other thing.
Stuff with Choice Scarf will probably be really obvious. Like, "Why is this Heracross switching in to my Darkrai?" or something like that. Either that, or the "stuff with Choice Scarf" won't deal enough damage to be worthy of your worry.
Honestly, I really want to know why anyone feels that we need to include Darkrai in the current OU. We already know it will be good, considering how many comparisons to Gengar are going around. The two Pokemon are fairly similar, and if that means anything, it means Darkrai will be at or around Gengar level power at worst. Do we need Darkrai in OU? Is there some special reason that it should be included? Because as far as I know, it's serving its purpose quite well in the land of Ubers.
Edit: Banned in Battle Tower means nothing, by the way. Considering they banned Jirachi and Celebi, I think they probably banned the main Legendary Pokemon from every game (Mewtwo, Lugia, Ho-Oh, Kyogre, Groudon, Rayquaza, Palkia, and Dialga), then banned every event-only Pokemon (Mew, Celebi, Jirachi, Manaphy (and Phione), Darkrai, Shaymin, Arceus).