Abomasnow
occa berry or leftovers
252hp 252sdef 4spatk
sassy
i would use abomasnow as a sub seeder so
substitute
leech seed
blizzard
ingrain/wood hammer/ice shard
Beartic
sitrus berry or leftovers or even life orb
252atk 100hp 156speed
adamant -as i said in the comment why lower speed when you have bulldoze bulldoze lowers the opponents speed so you dont want to be slower even after bulldoze
your movest looks good
maybe you could put in double team to really annoy the opponent :D im not suggesting that though
Walrein
defintly go leftovers
252hp 100def 56spatk 100spdef
modest
if you want to stall
go toxic
aqua ring
protect
blizzard
protect lets you recover for a free turn -while they take free damdge from toxic and hail -your walrein isnt even a staller more of a tank by the looks of it :)
Vanilluxe
i would go leftovers
you could keep sweeper or you could go stall with ice body :P
sweeper
you can scarf or specs it
but go blizzard
flash cannon
acid armor-double def or automize-double speed
water pulse
Cryoganal
your movest looks good but i would defintly avoid acrobatics you have a item get no stab and have base 50 atk
you could also run recover
but defintly run rapid spin like mew said if s rock is set up every pokemon you send in will loose a 1/4hp
Articuno
i dont know why you have a focus sash it a has great def and i know its week to common rock and fire but it out runs many rock
stone edge is your main problem -but its overcome
if you use snow cloak it has a low chance of hitting
if you use preasure and mioves like protect and sub they will run out of pp
i would run blizzard
roost
substitute
tailwind for support or uturn
go with leftovers
hth :)