Ooh, I forgot some ideas I had on the speed range for this thing.
118 Speed would be ideal. Just like Garchomp says screw you to the large group of base 100's, this would srew over the large amount of Pokemon who have 115 base Speed. An alternative is 122, for the purpose of messing with Dugtrio and co. I feel we should let Weavile remain the fastest Ice type, for some wierd reason.
Is there anything that resists Bug/Ice/Ground? Because Ground hits both Rock and Fire Super Effective, and Aerodactyl is the only one from that type range looking to outspeed this thing.
Also, if this had Compound Eyes or Snow Warning, we can focus more on the physical side with the Base Stats. No physical walls like eating Special Ice Moves, except for Bronzong and Cressy (weak to bug). This also allows it to carry the big bad EQ, which is more probable than Earth Power anyways.
Yah, I think my ability vote is going to be Compound Eyes, 91% Hypnosis or 97.5% Sleep Powder, 110.5% Megahorn, and 91% Blizzard. That sounds really good, especially if it has the attack stats to back it up. I don't see Magic Gaurd being feasible, and Shiver might be a little too tailor made. But we all know any Bug can have Compound Eyes.