You ninja'd me, but yes--this is, to me, it's biggest selling point. One of the main reasons sun is completely unviable now is that the two Drought mons are weak to Stealth Rocks (Ninetales and Charizard Y for those of you that don't know [which you should]). Drought Torterra, however, has the distinct advantage of being able to switch in and set up sun whenever you need it to. In addition to having pretty awesome synergy with Fire-type abusers, Torterra can really pave the way for sun teams with its STAB Earthquake.After looking over some calcs, Torterra does seem like a pretty cool pivot, and a physically defensive spread seems like it can do quite a lot. Talonflame is just going to murder the poor thing with auto-Sun, but that's what you have five other Pokemon for I suppose. As long as the rest of your team can support its weaknesses it should be able to hold its own, and the fact that it's a sun-setter that resists SR is gold for sun teams.
One mon you might see more of as a direct result of Torterra is Mega Houndoom. Now that it doesn't have to set up its own sun, its Nasty Plot set is poised to utterly decimate the meta. Let me show you the haunting power this thing brings…
+2 252 SpA Solar Power Mega Houndoom Dark Pulse vs. 252 HP / 252+ SpD Heatran in Sun: 286-337 (74 - 87.3%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
+2 252 SpA Solar Power Mega Houndoom Fire Blast vs. 252 HP / 4 SpD Eviolite Chansey in Sun: 543-640 (77.1 - 90.9%) -- 25% chance to OHKO after Stealth Rock
If you let this thing set up a Nasty Plot, you can kiss your team goodbye. It accomplishes at +2 what Manaphy fails to do at +6.
Commonly seen switch-ins to Mega Houndoom are Heatran, which is 2HKO'd at +2, and Tyranitar, who is terrified of Torterra. ScarfChomp can also tank a hit and KO with EQ, but that play is obvious and can easily be played around.