I've played on some battle servers and whatnot for a while, and it's pretty much a given to have a lead Drizzle Politoed for rain teams, who are much much better than before. Considering Politoed has access to Hypnosis and other support, he can do very well as a lead in that own manner. If hazards come up, Tentacruel has a nifty new ability in Rain Dish, so he can be placed in Rain teams for spinning and spikes. In the manner of Rain Stall, Rain Dish Blastoise can be equally frustrating with access to Rain Dish, Leftovers, and Aqua Ring, and can shuffle things with Dragon Tail. It's thoroughly frustrating.
Sun teams, on the other hand, are iffy. I never liked Ninetales, but she' a nice lead with Hypnosis, and can do a Specs set or Nasty Plot setup. Sun Teams aren't as dominating as Rain, though, as their members aren't exactly great in the way of coverage, as grass isn't the best attacking type. Still, since Growth now is like a fusion of Swords Dance and Nasty Plot in the sun, if they have a chance, Sun Teams can sweep after that. The main user of this I see happens to be Venusaur, who does well with Chlorophyll as a dream world ability.
Yep yep ♥