I'm a bit skeptical about this. While mamoswine isn't a bad choice for a team by any stretch, you need to be absolutely sure you want to use it over the likes of other ground and ice type attackers such as Garchomp, Lando-T, and most importantly, Weavile. Weavile is probably what you should be using over scarfed mamo. While mamo can Outspeed Mlop with a scarf, it's weaker due to having no item to hold and is forced to be locked into a move, which can be ugly if you're forced to use EQ. Also, the scarf set is pretty bad. You have options that are both faster and more powerful, like scarfed excadrill, scarfed terrakion, or scarfed Lando-T. Moving on from that. The lead off set is kinda cool, being able set up rocks and cripple a wall with endeavor, but it's shot down by Mlop with fake out or Mega Sableye. I'd also like to note that it actually fails to OHKO defensive Lando-T after intimidate with IC. The life orb set is cool, I suppose, but it has reletively poor defensive typing and is pretty slow. Furthermore, you have to choose between ice shard, Icicle Crash, and freeze dry on its sets. If you choose all of them, you're left with only EQ. While that's not the worst thing in the world factoring in Mamo's solid neutral coverage, but you miss out on superpower, stone edge, and knock off. I don't really wanna hate on mamo and it is somewhat anti-meta, but it still struggles due to low speed and special bulk. I don't really want to ramble and I'm just trying to be an obligatory devil's advocate against your reasoning for a rise. Have a good day!
I propose Mamo A- rank, this pokemon is really good in this metagame, where many run fast electric and many bulky ground as raikou, mega mane, lando-T, hippo, chomp, mamo can easily do extensive damage to these only with stab , plus it has access to ice shard, I think is really good for example against scarf lando-t, or however it is useful to eliminate his opponents pokemon with low life, another very good move is freeze dry, remove easily pokemon as gyarados, seismitoad, rotom-w and other bulky water, for example freeze dry by life orb mamo 2hko reg slowbro.
12 SpA Life Orb Mamoswine Freeze-Dry vs. 252 HP / 24 SpD Slowbro: 174-211 (44.1 - 53.5%) -- 87.5% chance to 2HKO after Stealth Rock and Leftovers recovery
mamo is also excellent with scarf, he can easily kill mega lop with superpower, combining the scarf at a great 130 atk really become a threat to the offensive team :)