Yep Zone is Scarf but I run just enough Speed on Landy to outrun max speed Timid Heatran, so unless it's Balloon or Scarf Landy beats it, and obviously if it lacks Will-O-Wisp Azumarill beats it. On the other hand outside of those two checks nothing else on my team really gets past it, unless it lacks Toxic in which case Talonflame can actually set up on it and wear it down. Either way the extra coverage seems pretty worth it so I'll have to give it a try.
Altaria is DDD, Latios isn't carrying Surf (although that is an interesting option... Would give me another answer to Heatran). Right now I'm using an extremely niche Draco / Psyshock / Defog / Memento set, cause Memento has proven to be amazing for opening holes that Altaria and Azumarill (Belly Drum set) can use to set up and clean house late game. On the other hand the lack of recovery means I need to play him sparingly.
Heh yeah. I'm thoroughly impressed by how amazing FairyMag teams are in the current meta, it's pretty much just like DragMag last generation, except even better in my opinion. So I decided, why not combine a Fairy spam core of M-Altaria and Azumarill with a FairyMag archetype? After that I added a mandatory Rocker, a mandatory Defogger, and a Talonflame to fill a few holes, and the result has been pretty impressive so far.
On a side note, your new challenge features BL Pokemon, I just made a team with a BL Pokemon on it, and your banner has an Azelf on it. Coincidence????