First impressions based on my first few battles using this team: I'd say that Keldeo is definitely the MVP. This team has trouble breaking through defensive cores otherwise, so I advise you guys to play conservatively with it, at least until the opponent's physical tanks have been removed. SubPass Gliscor is incredibly fun to use, and has great synergy with Keldeo especially.
I'm at a bit of a tossup between running Earthquake or Toxic on Bronzong. Earthquake stops it from being complete Tentacruel/SubCM Jirachi bait, but Toxic allows it to deal with Politoed, which always seems to come in on Zong.
IMO, Latias isn't quite bulky enough to reliably check rain/sun. I'm not sure if it's just me not playing it well, but it just seems to die far too quickly to do a good job of it, especially with LO recoil + potential sandstorm damage taken into account as well. The power the LO set has over bulkier sets is necessary for this team at the moment though, so it's a bit eh.