OK this is a great team, I've seen it in action being used by cim and it has amazing sweeping potential in almost every one of its members.
That said, there are some suggestions that I can do that may be worth it, one is running enough Speed on Nidoqueen to creep on 144 Speed EVs Crobat, since it's kind of a benchmark for her. The problem with this is that she's forced to run 224 Speed EVs with a neutral nature, which really cuts her bulk. That said, she can still tank Scarf Hera's hits with ease and burn it to the ground. It's up to you.
I really think you should run enough Speed on Zapdos to outpace Scarf Hera and Darmanitan at +1, you could settle for Jolly Hera and put the rest into HP, then again you can simply go with max Timid to also get the jump on Jolly Darm (though I'm not sure how common they are). Iirc, though, max Speed neutral base 100s outspeed positive nature base 85s and all Rotom-A, that way you can continue running a Modest nature to strike everything hard at +1.
About Chandelure, yea with a Modest nature it gets a guaranteed OHKO on 0/4 Mew after SR, with a Timid nature it'll only happen 11 out of 16 times. Feel free to make that decision though, I've always thought that Chandy should run Modest to make full use of its amazing Special Attack stat, but I guess outspeeding max Speed base 130s is kind of a big deal, especially considering a well played CB Crobat, however rare it may be, can really threaten your team if Zapdos isn't healthy enough.
Anyway amazing team once again, kokoloko. I really like it how most hazard setters really struggle to set up against you, since that way you can keep your field clean and get an easier sweep (Taunt Aerodactyl screws you over, though :P)
PS: Amazing use of Memento on Scarf Chandy, I've seen it in action and it's completely game changing! Also, #venomothforubers2013, make it happen lol