You can't really pin down a "best deck" there are multiple good decks that have their ups and downs when it comes to a variety of match-ups. The fact remains that there is no singular BDIF and that you can pick one of several decks and have an equally good chance of doing well. From a competitive perspective this favors deck building more than deck choosing. You can check the "what won cities" thread for a breakdown of what decks did well and where and there was actually a very solid article posted on PokeBeach that was recently nominated to the front page. It contains a grid breakdown of match-up percentages.
As far as a list of good decks goes...:
ZPST (I liked this one a lot more during cities but don't favor it States on, I wouldn't completely discredit it though).
Durant (A very solid choice for someone unsure of their format although I feel the luck factor and possible poor match ups make it a mediocre choice for a larger tournament like States. Again, would not disregard this deck).
Magnezone/ Eels (Right now I feel that this deck is one of the best choices, my only concern is Donphan, Terrakion, and Landorus).
Cake (It is a solid choice but I personally don't like it).
Chandelure (A tricky deck that has done considerably well, definitely a contender).
I would say that those are the best choices based on my personal experience. You can't really go wrong with any of them so happy testing.
I believe that "best deck" is ENTIRELY based on your Meta. If Durant is rampant, then tyram is gold. If mewtwo is king, then Durant is a solid play. You really have to guestimate what your meta will be before you can designate a BDIF.
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Mewtwo is not BDIF, mewtwo is BTIF (best tech in format)
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Ok so you said zpst I think the t will become another z I think for zekrom exYou can't really pin down a "best deck" there are multiple good decks that have their ups and downs when it comes to a variety of match-ups. The fact remains that there is no singular BDIF and that you can pick one of several decks and have an equally good chance of doing well. From a competitive perspective this favors deck building more than deck choosing. You can check the "what won cities" thread for a breakdown of what decks did well and where and there was actually a very solid article posted on PokeBeach that was recently nominated to the front page. It contains a grid breakdown of match-up percentages.
As far as a list of good decks goes...:
ZPST (I liked this one a lot more during cities but don't favor it States on, I wouldn't completely discredit it though).
Durant (A very solid choice for someone unsure of their format although I feel the luck factor and possible poor match ups make it a mediocre choice for a larger tournament like States. Again, would not disregard this deck).
Magnezone/ Eels (Right now I feel that this deck is one of the best choices, my only concern is Donphan, Terrakion, and Landorus).
Cake (It is a solid choice but I personally don't like it).
Chandelure (A tricky deck that has done considerably well, definitely a contender).
I would say that those are the best choices based on my personal experience. You can't really go wrong with any of them so happy testing.
There will never be a BDIF, as all decks have weakness of some sort. Almost any lock is avoidable in some form, and no one card is necessarily better than another. It's not about the card, it's about how you use the card. Similarly, it's not about the deck, it's about the player. If you give a three-year-old a Durant deck, will they win against a Master playing a theme deck? Probably not. (assuming that a three-year-old has the attention span, of course)