loling at anyone who thinks Rain isn't broken. Also, Tyrant626, you're saying not only that Hail will dominate all regular play if the other weathers are banned, but also that we shouldn't ban weather because it will make Toxicroak useless. Think about what you're saying for a second.
This post is a bit old, but the point is that Lati@s >>> Pikachu. Similarly, Darkrai > Breloom. This makes Dark Void better than Spore by a similar means that Soul Dew is better than Light Ball - better distribution. Yes, the difference may not be so night and day as Latios and Pikachu, but Darkrai is a better Sleep abuser than Breloom. That's all that matters. Also, there's the tiny little difference that Justice Heart doesn't grant Dark immunity, so DV has no immunities and Spore does, so there's a tiny advantage to DV there. But the main point is that DV is better because it can be used by the best Sleep abuser.
Quoting this because it's one of the few coherent posts in this thread. Even though this argument has quieted down, I feel the need to point out a few things.
As for the Soul Dew vs. Light Ball conflict: the reasoning behind banning a part of a pokemon is that that part of the pokemon makes it overpowered, and that the pokemon is not overpowered in itself.
Soul Dew breaks all of the pokemon it's given to, while Light Ball doesn't. Arguing that the Latis with Soul Dew were decided overpowered before being tiered and that Pikachu wasn't is just semantics at best. Light Ball can not be argued to be broken in itself, because it in no way breaks any of the pokemon it's given to, while Soul Dew does. The only reason Light Ball would be broken is if it broke every pokemon it was given to. The only pokemon it can be given to is not broken with it, so the only reason to ban it would be on principle, that something else would be broken while holding it, which is not a valid argument. And separating Pikachu's different formes-with and without a Light Ball-is again semantics at best, because both are NU and not overpowered in any tier.
As for the Dark Void conflict: does Dark Void make Darkrai broken? Is it the sole reason that Darkrai is overpowered? Does it make every pokemon with a similar move overpowered? The answer to all of these questions is a resounding no.
Darkrai's huge speed and special attack, along with access to Nasty Plot, make it the best sleep abuser, but does not make Dark Void any more broken. The brokenness of one pokemon with a move does not make every pokemon with that move broken. Breloom has Spore, and it is not overpowered with it, which relates directly to the reason that Light Ball is not broken in itself: because not all pokemon using it are broken. The point you state, that Soul Dew is better than Light Ball, due its better distribution, and that Dark Void is better than Spore, due to its better distribution, also holds no water, since the moves are exactly the same, and because Darkrai is not overpowered because of Dark Void.
It's debatable whether Darkrai would not be overpowered without Dark Void, but Dark Void is not the sole reason that Darkrai is overpowered, which is enough reason not to ban Dark Void in itself, but also, a 100% better move, Spore (don't give me that Herbivore bullshit), is not overpowered on the pokemon that get it, at least one of which is not anywhere near mediocre. You can't argue that Dark Void's distribution makes it broken, because Breloom gets the exact same move, and is a powerful pokemon in itself, but is not overpowered with it. As you stated, Darkrai is simply the best Sleep abuser due to its other attributes, namely its blazing speed and special attack, and access to Nasty Plot, which do make it broken, unlike Dark Void, which does not.
This will probably be my last post on the subject; I just don't think any of my arguments are going through. I apologize for any rudeness present in this post; if it's present, it's unintentional.