Im answering these moveset questions with lots of things, because, as iam going on vacation soon, I need to get as many points as possible. Now, onto Abomasnow.
Physical: Start With Swords Dance(amazing attack now!) and then Avalanche, as he is slow. Next, the classic Earthquake. Then, Razor Leaf or wood hammer, depending on the one you like, for some STAB. Finally, the last slot can be whatever you want. Reflect/Light Screenare options, if you like, along with toxic and Iron Tail, and Return.
Special: Begin With Ingrain, hes going to need it. Next up, is Blizzard, for its ability. Giga Drain is good, up next, too, for even more healing and STAB. Finally, add in Earthquake, he cant be all special.