And for ubers, is Foretress, Jirachi, or Deoxys-S the best start?
I personally like Custap Berry Forretress, since it can beat Deoxys-S with Gyro Ball + Rapid Spin. Forretress gets Toxic Spikes too, which is really helpful in Ubers. Deoxys-S is probably the most reliable Stealth Rocks/Spikes setter though. Also, due to team preview, you don't need a dedicated lead for most teams since your opponent can just choose send out a Pokemon that beats your lead Pokemon. However, having a dedicated lead to lay down Spikes and Stealth is really useful on a hyper-offensive team, where using your sweepers to set-up hazards would lost momentum.
Also, how do you guys think the new Defog mechanics are going to change the metagame?