Well the main issue here I see now are Sun teams. Between Venusaur and Sawsbuck, you're going to do a lot of scrambling around. Opposing Heatrans seem even more annoying as they can run any of Flame Charge sets along with Earth Power and such.
Although the greatest threat, might be Volcarona. It's outsped by Latios yes, but at that point, you can't really OHKO it any longer. Are you sure you wouldn't like to use Heatran instead over Jirachi? It could come a long way, also carrying a Balloon to add even more annoyance. It'll also eliminate the annoying Venusaur for sure.
Otherwise the team seems nearly perfect against all teams that aren't sun.