I haven't really given SD Infernape a fair chance this generation due to not being able to use Iron Fist with thunder punch, not having a high base power physical fire typed STAb attack that doesn't give you tremendous recoil, and sometimes having coverage issues depending on what you're facing. Blaziken was able to get away with SD+FB, so I guess infernape can do it too...aside from getting revenged by scarfers of course. I'm not too fond of just using scarftar as a partner though. Alakazam has been getting more common and scarftar doesn't outspeed him at all. I guess Rotom-W and Scarf Hydreigon could be of assistance instead. I might try it out later on.