Avalugg has 90 HP and 184 Def(probably 185 in reality). Terrible special defense, and of course, terrible typing for it, but still. Higher than Aggron if he isn't Mega-Evolved. Him and Regice are the new defensive core for ice teams that have fooled themselves into thinking they casn be defensive.
I was never really sure whether to use Weavile. I felt like he never really had the power to do much, especially since none of the moves he can use are particularly powerful. I've ended up going more for a bulky offense set, with Megabomasnow being the perfect example. He can take most any non-fire hit (crits keep fucking me over though) and be fine, and has so much power(especially comapred to non-mega) and incredble coverage with my set. Blizzard/Ice Shard/Earthquake/Giga Drain. Hail means he effectively ignores focus sash and sturdy for non ice-types, and ice shard anyway, so.
Aurorus is amazing so far, even though people say she's terrible. Yes, 4x weakness to fighting and steel, but I sash her for a reason. Plus, she's the best place to put HP Fire on. (Blizzard/Freeze Dry/Ancient Power/HP Fire). If she was physical, Return would be great with Refrigerate.
Speaking of which, Mega-Pinsir only be becomes more terrifying, and I believe is single-handedly the most terrifying single pokemon ever.
Oh yeah, and I like mega-heracross; Skill Link, Pin Missile, Bullet Seed, Rock Blast, and you can opt for Close Combat(for power) or Arm Thrust(since he doesn't need much more power with that Attack stat, and it doesn't lower is defenses since he's slow). If his base is moxie, and you get a kill before mega-evolving... Good luck with that, bud.
Back to ice; Ice should be resistant to poison, possibly grass, and maybe normal and electric, strong against water, not strong against flying(I never understood that) or ground(or that), and/or strong against rock if it's gonna be strong against ground(you freeze rock, if there's water inside, it splits), resisted by ghost, and weak to...i dunno. It's already weak to the things that would make sense I think.
I may just possibly be biased.
Akroma, Ice-Fairy type. Even better for countering dragons. Give it a Flying Press style move and you're set.
Edit: That was amazing, GWG. Also, Vanilluxe's only natural predator is Lickitung. Slurpuff's too.
Lickilicky versus Muk. This can't go well.