Aaah, you guys dont know how much time i have waited for a tread where i could post this :]
I have been testing krook on the OU meta since XY ( when i joined ) and i got to a conclusion.. It can work.
The sets i will be comentating are in this paste :
http://pastebin.com/5QJswius
1- Scarf Set: altho pretty bad in krook's native tier, the scarf set is the one who most shines in the OU meta, thanks to its typing and good speed for a scarfer (its niche over ttar ), krook is able to reliably revenge kill many things, like exca, mega manectric, raikou and mega meta ( assuiming it has took some chunk like 25% ) ttar, mega zam and regular too ( assuming sash is broken ), and many other things after chip damage. This krook set can actually sweep a team that has its pokemon weakened ( dont believe me ??
http://replay.pokemonshowdown.com/ou-430900514 ) but its not the better part, its biggest point on the tier is pursuit, being able to remove lati@s is huge, and krooko often forces them to not to drop the draco on the fear to be revenge killed by this. The last moves i would use most as fillers, aerial ace for hera ( weak move tho, but it can cath it off guard ), fire fang for scizor M, Edge for flying types, superpower for lop and rocks for support ( altho its not nice to have it, if you dont have another setter.... ).
0-Good teamates :
-Mags (yeah, ton>zone, NFE is power ) are real usefull, trapping skar, scizor, ferro and treatening clefable with their powerfull flash cannon, gives krook free switchs too by just volting.
-Pokemon that like lati@s been gone, like amoonguss, M venu, Bro, Rotom, keldeo and other really like krook's job to pursuit and pressure them
-Hard hitting pokemon like heracross, pinsir, keldeo, Y zard and others help krook, punching holes on the oponent's team for the rare sweep
0- Scarf Krook's outclassers and counters :
Weavile- Just can run an atacking item to hit hard, and so outclasses it as pursuiter, but cant sweep
Ttar- can switch into the latibros and has more atack, but does not have krook's speed, cant sweep and does not have knock
Bulky pokemon that can recover on krook/take too little ( landot ) are hard to break, altho they usually hate gettin knocked off
2- defensive set. this one i found out to not be that much of a thing, but it can still wall some things like zard X, tar and driller
Good parteners- pokemon that like powerfull fisical atackers like xard and sand cores gone, or the teams who would like to have a taunt SR lead, that can beat skarm and others
outclassers - 100% outclassed by landot besides the fact that it has roar and taunt
Shouts :
mencemeat : for building the krook team i use now,
ericaroselia : just a good fren afterall, you need them :], and LuckyRyu ( dont know his smogon :- , that has helped me a ton to become a (i consider myself ) medium player of this game.