Cresselia can also take hits and Ice Beam back, defensive Celebi can recover and Leech Seed (but it's setup fodder unless it runs HP Ice), Dusclops/Dusknoir can take a few hits and Will-O-Wisp or Ice Punch, and there are a few other bulky walls that can take unboosted hits.
The problem is if Garchomp gets up an SD, it 2HKOs all these walls, many of them are setup fodder, and being walls, unless they have a recovery move, they're severely crippled by taking Garchomp's Outrages.
Also, as a rule, anything Scarfed should be easily dealt with, IMO.