Many of Abomasnow's checks are worn down by Toxic Spikes, so I bring to you…
Dragalge (M) @ Black Sludge
Trait: Adaptability
EVs: 252 HP/4 SpA/252 SpD
Nature: Sassy/Gentle
-Toxic Spikes
-Dragon Tail
-Venoshock
-Hydro Pump/Hidden Power Fire
Dragalge has the advantage of resisting Fire, Poison, and Fighting, while Abomasnow can switch into Ground-types, making this a good synergy pair. Dragalge is meant to primarily set Toxic Spikes and so it gets a specially defensive spread. Dragon Tail gets an Adaptability boost and lets you poison opponents more quickly. Venoshock abuses the power of Toxic Spikes and gives Dragalge a STAB move that, on a poisoned opponent, gets the same base power as Draco Meteor without the SpA drop. The last slot is really debatable since we only have one other member. Hydro Pump nails Emboar, Moltres, Delphox, etc., while Hidden Power Fire is primarily for Escavalier, which otherwise gives this core major headaches.