Sorry to say...
I never tried out Bisharp. D:
Besides that though, I'd like to say a few things first.
One, this whole "weather makes OU boring" argument to back up the all weather ban feels like total BS.
In DPPt (and to a much lesser extent, ADV), Sandstorm was (nearly) everywhere in OU, due to Tyranitar's popularity.
When looking at that Gen, I saw no one complaining about Sand making the tier dull.
And now, 1 Gen later, Sand got some competition, DIFFERENT weather was now in the tier and here we are complaining that weather is making OU stale. Look back and think about how stupid saying that is now.
Also, why not make a tier where weather is BANNED seperate from OU?
At least then you won't hear anyone complaining about weather making the tier stale...
And lastly, why did someone whine in nominations about a defensive core being hard to break?
A defensive core is SUPPOSED to be hard to break, as otherwise it wouldn't be a good core.
This is kinda a load of trash you're talking.
Gen 4 Sand: Did some minor passive damage, to anything not Ground, Rock or Steel typed. Gave Rock types a x1.5 boost to Special Defense, which, in OU terms... it was Tyranitar only who could make use of it.
Gen 5 Sand: Does all of what Gen 4 Sand did, but also becomes a far more active weather due to Excadrill, and, to some extent, Landorus. There is also another pokemon, Terrakion, that can actually use the Sp.Def boost from Sand. In addittion, to screws with Sun and Rain.
However, I am of the opinion, and have been since the word go, that the problems with Sand are Garchomp and Excadrill. Everything else is OK, and banning those two would allow Sand to remain in OU.
Just like, since the word go, I've been for banning Politoad over Drizzle, and, in the unlikly event that we need to do so, Ninetails over Drought. Banning the ability itself opens the floodgates for people to start saying "Unban Blaziken with Speed Boost pl0x", even though the simple argument is Drizzle and Drought themselves are broken, while Speed Boost is only broken on Blaziken.
In all honesty, I think Rain's had too many nerfs as it is to even think about keeping it now, when it's so powerful that things like Gastrodon are moving to OU to check it. It's already had one pokemon banned, and a whole abililty banned in tandem [Which I see as soft-banning Kingdra, Kabutops, Ludicolo, ect]. Hell, I think if SS+Drizzle was suddenly reverted, Drizzle would be emergancy banned now, because people now have the brains to do more than spam 3 Swift Swimmers, Ferrothorn, and Filler.
Sun hasn't had a fair test, and may be salvageable by banning, say, Volcarona, and Sand is easily able to be kept by banning Excadrill.
Seriously, in three, maybe even two, bans, I think we could re-introduce a pokemon [Manaphy], and keep three of the weathers but not so powerful that they dominate everything else.