Bulky pivot with Regen so you don't have to stop and recover as many times, which loses momentum which you don't want to do when playing hail. It also serves as a very good ponyta check, pawniard bait, vullaby bait, mudbray check, a very nice glue mon in general.
I believe Amaura to be much better than Snover offensively, it has more utility as well in Aurora Veil, Stealth Rocks, and Thunder wave if you want to go for a support role with it instead. Snover really just does not do anything at all except be able to take a grassy glide from Grookey and then die to drain punch or uturn. It is so bad by itself that people run icy rock with it, because it's so bad it can't do anything but set hail, and personally I don't see the appeal of that. In contrast, Amaura can be a great endgame cleaner with Blizzard, it's also one of the trickiest mons to switch into. It has epower to punish Pawniard/Ponyta, Ancient power for larvesta, Blizzard just 2hkos most mons that don't resist ice, and Freeze dry to trip up water types. Alolan Sandshrew on this team is life orb instead of the traditional swords dance evio/wide lens set, because I don't believe in swords dance Sandshrew. It really doesn't set up on many mons, the only safe things you can set up on are porygon and mareanie if you want to take your chances in getting burnt, and it wastes hail turns. Wasting hail turns is less of a problem when you use icy rock snover, but as I said earlier, icy rock snover also does nothing except set hail, so I would rather not have to use it. Scarf Amaura gives you 4 turns of hail, in that time you have to get the sandshrew in safely, which is already quite a chore, by the time you try to swords dance you probably have literally 1 turn of hail left, it's really not worth it. Wide lens sandshrew doesn't miss triple axel, true, but wide lens sandshrew also can't kill anything without a swords dance boost, which we don't have the time for with scarf amaura, so that is why I opted for life orb. At least you get kills 72% of the time, instead of 0% of the time
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picks up the slack for fight resist since slowpoke really isn't a good fight resist. I like Koffing instead of mareanie because opposing mienfoos get free momentum from pivoting off your mareanie all the time, and can follow up with trapping your mareanie with diglett, which is even worse for a hail team with no other fight resists. Stopping regen is also nice, so once the opposing foo is in either amaura range or shrew range, you don't have to worry as much about it recovering all of that health with a couple of pivots.
traps most annoying mons, such as Ponyta, Mareanie, Staryu, Ferroseed, Pawniard, Abra, Larvesta, weakened Mienfoo, you get the idea.
a slightly bulkier foo than normal, in order to absorb hits better, provide slow uturn support, and also beat opposing lead mienfoos if they try to stay in. Stone Edge for Larvesta because I didn't feel fake out was that useful, plus this hail team struggles to switch into larv.