Crit is still stupid to rely on. Blaze Kick is okay but pales compared to Flare Blitz, Flare Blitz's recoil helps with Blaze, but perhaps Kick is better for Blaziken's case, 80 base speed means he's easy picking for revenge killers or priority attacks. Either way, spamming that one move and hoping for a critical gets predictable, they could easily throw in a fire resist, such as Swampert, maybe a thick fat Snorlax with curse support (It's pretty hard remembering Pokemon now..) Blaziken may have Scarf potential with high Special Attack and Physical, but generally is avoided due to his 80 base speed. But sure, if you want to counter that base, scarfing it is the only option unless you want to rely on agility passing from a supporter. (I don't even know if it's a good idea, just browse Smogon or some other Competitive Pokemon community. >_>)
Eh, I shouldn't be talking, Competitive Pokemon is behind me now.