Not yet, but I'm looking the best I can. Even swarming I still got a feeling finding it won't be super easy due to it being a legend. Edit: Found and caught it, like right after I posted. XD
It took me a couple minutes of browsing but I managed to find it too. It was a pretty tough catch though! I used about 9 ultra balls. x-x
I haven't found one yet. I don't want to catch one anyway because I'm not the biggest fan of Heatran. Loving the idea behind this swarming thing though! Can't wait until I Pokémon I like swarms ^^
Just got the Lava Dome Pokémon in the Lounge! Little bugger took 10 Pokeballs, a Great and 6 Ultras, but worth!
Also found one earlier, took 12 Pokeballs, 6 Great balls, and 4 Ultras- was caught on the very last ball. Lucky me, huh?