Could there be any benefit of using a Mamoswine with Avalanche? Most of the time it will outdamage Icicle Crash.
It can make several OHKOs and 2HKOs that Icicle Crash couldn't (as long as Mamoswine gets hit by a move). It can OHKO Charizard Y (although Icicle Crash + Ice Shard does this as well), OHKO Talonflame (although Icicle Crash + Recoil damage does this), OHKO Charizard X in conjunction with Ice Shard (although Earthquake does this as well, and it's technically a 2HKO), 2HKO Quagsire, has a chance of 2HKOing Skarmory, reliably 2HKO Mega Venusaur (although Earthquake does this as well), 2HKO Bisharp (although Earthquake OHKOs it, I'm just saying that it can 2HKO Bisharp as well), 3HKOs Gyarados, OHKOs Excadrill (if it's holding an Air Balloon, Earthquake can't do this), has a chance of 2HKOing Ferrothorn, can OHKO physically defensive Hippowdon, has a chance of OHKOing Terrakion, has a chance of OHKOing Mandibuzz, 2HKOs Chansey, and guaranteed 2HKOs Tyranitar (although Earthquake can OHKO).
Most of these calcs aren't quite as relevant as they would be because the opponent has to actually attack Mamoswine for it to work (it especially loses relevance with Chansey, Skarmory, and Ferrothorn), and it can't take some of these Pokemon's attacks without significant defensive investment or Assault Vest, but the sheer power seems too good to completely ignore. I was using 252+ with Life Orb for all of those, so it might be hard to find a spread that would work for that, but whatever. It still seems cool. Also using this in conjunction with a Taunt user sounds awesome.