I've seen it posted once or twice, but what I run, with great effectiveness I might add is:
252 atk/252 speed/4 Hp
High Jump Kick
Shadow claw covers almost everything your STAB moves don't, and HJK plows through everything after one Hone Claws. Another benefit to this set is that Blaze Kick and Shadow Claw both have higher crit ratios, turning the luck factor to your side, as you no longer have to worry about misses but get the added benefit of criticals.
Personally, I run this as a mega set. No, Blaziken does not have the best Mega Evolution. However, while not that significant an increase, the additional 10 points in each defense help him to barely survive one hit that would usually kill it. I've found he lives through most non-STAB (and some STAB) SE attacks, albeit barely, as Mega Blaziken. This is very beneficial to setting up Hone Claws and increasing speed.
Winds, stay with me!
Have: Several Adamant Larvitar with 5 maxed IVs, any whatever order you would like. Currently out if D-Dance Larvitar, however will breed one for right offer.
Adamant Speed Boost Torchic: 31/31/31/x/31/31
More Torchic and Larvitar than you can count with anywhere from 1-4 maxed IVs, all of the Torchic have Max Attack for sure. Most of both of these have adamant natures.
PM me your offers.