Depending on your team, it can be a good addition, since it can learn grass type moves for use against Bertha, the ground Elite four. And its Ice moves are useful against Dragon types. If u already have those types, no need to bring another.
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Abomasnow is a decent Pokemon with well rounded stats and a unique typing that gives it good type coverage. However Abomasnow's unique typing also lets it down by giving it a large number of type weaknesses.
See question "Is this a good team to beat the elite four"'s answer.
I would suggest having your whole team above level 50 so you have a chance to beat the Elite Four. I think the Elite Four Pokemon are at level 50-60, so well trained level 50 Pokemon will be good for the elite four.
Well,Level 70-100 Is A Good Level To Beat The Elite 4.
Sigh. There is a Pokemon center in the place with the door to the elite four. It has a pokemart too. But if you're in the middle of the elite four, you can't heal your party. You have to depend on potions, which is a good tactic to beat the elite four. (This is an obvious answer...)