>>29860195Freeze Dry is a must, it's basically a big fuck you to most would be bulky waters and rain teams.
Double Slush Rush user goes without saying, you could actually run both Beartic and Sandslash with the latter as a backup sweeper. If you really don't like Sandslash then
Mamoswine is also possible as a option as it is a nice big powerhouse that can work in and outside of Hail and benefits the most from Aurora Veil being up.
A backup manual hail setter and extra Aurora Veil user is ideal as well as accidents always happen and is basically standard practice for weather to always have redundancy and fallbacks.
Froslass is a ideal utility between it's support options like WoW, Destiny Bond, Spikes, fast Aurora Veil and Hail. Anyone who ever faced it in Gen 5 UU will tell you how deceptively hard to kill it is. Cryogonal is also looking good with it's buffed stats, Recover, Rapid Spin and fast Aurora Veil too.
Thick Fat Walrein is notable as the only Ice type in the whole game who resists Fire but doesn't offer much else.
I actually think Ice got a really good deal this time round in Gen 7, you can actually make a really effective Hail team if you get creative enough.