It blankets wide areas in snow by whipping up blizzards. It is also known as “The Ice Monster.”
– Pokemon X Pokedex
Abomasnow is the only Ice type Pokemon to get a Mega Evolution (that we know of so far). It’s kind of a strange choice to make Mega I think. I’m quite fond of Abomasnow (I had a Hail team), but with Snow Warning nerfed in Gen VI (Hail only lasts 5 turns instead of permanently until replaced), I’m not sure about how usable Mega Abomasnow is.
Its speed is lowered to base 30 (probably because it’s bigger and more immobile-looking). Its Defenses are increased to 105 both, but I’m not sure how useful that is, given Abomasnow’s 7 weaknesses (including double weakness to Fire). Its Attack and Sp Attack are raised to a respectable 132, but because it’s so slow, I’m not sure if it would survive well enough to use its massive attacks.
Luckily, it can learn Ice Shard. It has 2 more attack than Mamoswine, but unfortunately because it needs the Mega Stone, cannot hold a Choice Band.