This was a pretty innovative core, it featured 2 mons that don't have a lot of spotlight on Ice Teams as it is, but work great together! It's a little weird for me to not run a Mega, so I had to team build a bit differently than I'm often used to, and put mons into roles that I've never really had them play before.
Aurorus was the first required mon, and I snatched Broc's lead set, which I can't lie is pretty fun to use. Stealth Rock help tremendously vs Fire and Flying both, limiting switching and wears down mons gradually. Blizzard is the main STAB attack, with a pretty fair amount of power backed behind it. Thunder Wave really helps to slow down major threats, and make them much more manageable. Encore is pretty nifty, especially against opposing leads and set up sweepers, locking them into the last move they used. Snow-Warning is an awesome ability, automatically setting hail up upon switching, so it can break sashes, and allow both it and Rotom to fire off perfect accuracy Blizzards! Aurorus is pretty underrated in my option, and probably could be considered for teams more often!
Rotom-Frost is the 2nd mon I needed, and I opted for bulky Choice Specs set. The reason being is that it is 1 of 3 viable checks to Scizor, and I have a nice winton vs Water (which surprisingly enough can often prove to be difficult without Lapras or Rotom). From there he's kinda self explanatory.
Cloyster was the 3rd mon I decided on the reason being I have a nice cleaner since I'm now using a different Kyurem set. Jolly Nature allows it to outspend Victini after a Shell Smash boost, and it speed ties with Jolly Breloom, which can be pretty nifty. Here I decided to use Razor Shell over Ice Shard/Hydro Pump because I wanted a more reliable Water STAB, which can make mons like Heatran a little easier to handle.
Kyurem I typically opt for Choice Scarf, given its incredible power and ease to sweep once incredibly bulky walls are out, but on this team I wanted to give LO Kyurem a shot. I was lacking a good Wallbreaker without Mega Glalie or Mamoswine, so I resorted to Kyurem to take on that role. Movies I don't think I need to go over, but Roost is to keep it around for a while and prevent it from being too worn down.
Avalugg I feel is mandatory to have on an Ice Team if you want any success. He is the best Physical Wall you can have, and on top of that it has access to Rapid Spin (which is a must given all Ice mons bar Piloswine and Mamoswine are weak to SR). He has the ability to check Terrakion, Bisharp, Mega Lopunny, and Heracross with a combination of Rocky Helment and Avalance/Earthquake. Incredibly obligatory to have, its a godsend from Gen 6!
The last pokemon I decided on Choice Scarf Weavile. I've been wanting to try this, given it can outspend and KO both Victini and Jirachi (the 2nd of which typically most times people will click X). It's unbelievably fast, imagining with an Adamant Nature its only 1 speed point short of base 110s, you can imagine he's no joke. Knock Off and Icicle Crash are your main STABs, Low Kick is for general Fighting coverage, and Pursuit is for mons that feel safe to switch out against it, and usually take pretty heavy damage.