A few of us just noticed this on IRC tonight.
Crunch on Lucario is now essentially useless. Mew is gone. Slowbro is gone. Victini is gone (but there's a better option available that I'll mention very soon). Instead, Lucario can now run Earthquake, and simultaneously destroy Chandelure and Nidoqueen switch-ins (yes Iron Tail has merit against fairies and Weezing/other Ghost-types, but it misses a lot, and that's the extent of its use).
Besides Doublade or revenge killing it, what's supposed to stop SD Lucario once it's at +2? What I really noticed was that outside of Sableye's prankster Will-O-Wisp, there isn't anything that can handle Lucario in this meta right now. Not even super obscure checks like Weezing (+2 CC does >50%) or max/max Cofagrigus (+2 EQ does about 50% iirc) want to play around with a set up Lucario, especially if it runs Iron Tail over EQ (both are OHKO'd after SR iirc). Nothing can switch-in to that Lucario. The only things that beat it are Doublade, a Prankster Will-O-Wisp, using faster revenge killers that won't die to an Extremespeed (Scarf Chandelure / Cobalion), strong priority that will efficiently dispose of Lucario (CB Infernape's Mach Punch for example), or not letting it set up in the first place.
I don't know. This is just on paper. From the sounds of things, Lucario isn't the easiest thing to set up. It could be that it's late too, and I'm just missing something blatantly obvious. Just figured it might be worth discussing beyond IRC.