Cloyster shouldn't be used as an example, it's got a very good base defence, but due to it's weakness to very common attacking types, and it's lack of a reliable recovery move etc, it is outclassed by many other physical walls. Abomasnow cannot take a hit for crap, especially not an SD Earthquake, and is slower than Garchomp anyway. Scarfed Abomasnow is an abomination, you're pulling at straws, no-one in their right mind would use it. The only decent thing Abomasnow has going for it is the sub punching/seeding sets, which would no longer be viable with Choice Scarf.
Articuno is OHKO'd by SD Outrage, and cannot OHKO with Ice Beam due to Yache Berry, same goes for Dewgong, and is also never seen in competitive OU play. We've heard all this before from other people, but seriously, it isn't well thought out. That's like saying 'Oh, Wobbuffet is easy to beat if you run a Garchomp with Toxic! Seriously, creating a moveset to counter 1 pokemon isn't all that smart, and usually backfires far more often than not.
~T_S