>>28379735He didn't really need DD, his speed tier was ridiculously good since it let him outspeed pretty much everything that threatened him. The only stuff that outsped him and carried ice moves like Weavile and Jolteon just didn't have the power to bring him down in one hit, especially if he still had his Yache berry.
The only reason that DD would be good now is that it would make his mega much better. Right now M-Chomp is actually worse than scarfing or banding him. For standard chomp, SD is still superior. But in a world with M-Mence, DDchomp isn't exactly a new apex of non-legendary power.
>>28379869Inner Focus is a really good ability in doubles especially given Weavile's primary role in doubles as the fastest fake out user.
>>28379962Fastest fakeout in VGC meta. Fast taunt and the ability to outspeed and OHKO M-Mence. It has a niche role which is all a pokemon really needs to stay relevant.