hi, in the OP Latios is still Modest and idk why you would want Jolly on it, Timid is much better in that it doesn't lower your special attack. I second QD on Volcarona because you can form a TopMoth combo with Ambipom (or Weavile). If you're going to use Ray's spread on Chop, you have to use Haban. Without it, the SpDef EVs are pointless.
Happy to give VGC team rates! PM me anytime and I'll rate as soon as I can.
VGC 2013 San Jose: 2nd place Seniors Division