Sand Force: Change Tier
Mold Breaker: Change Tier
Moxie: Change Tier
Magnet Pull: Do Not Change Tier
Quick Feet: Do Not Change Tier
Sturdy: Change Tier
Speed Boost: Do not Change Tier
Magic Guard: Do not Change Tier
I understand we're attempting to apply these tiers in the sense of some generic "OU quality" Pokemon, but looking over the current OU as an example, Moxie doesn't seem to make enough things better to meet the standards of an A tier ability. I've divided OU into three categories, things it would help, things it might, and things it wouldn't and it just doesn't seem like it would do enough to fit the criterion of being able to be slapped on to just about anything and making it better.
Definitely made better than without it: Haxorus, Conkeldurr, Salamence (already has it ScarfMoxieMence is great), Metagross, Dragonite, Tyranitar, Mamoswine, Terrakion, Landorus, Mienshao, Tornadus, Lucario, Hydreigon, Infernape, Gliscor, Scrafty, Virizion
Maybe made better: Scizor (doesn't do much for its choice sets (actually probably makes them a little worse) since, outside of a bullet punch endgame sweep it's either switching out with uturn or being forced out the next turn when the opponent switches in, Swords Dance would probably appreciate it though and there could be options I'm missing.), Breloom (loses all the pseudo-bulk of poison heal, but it could still Mach Punch sweep in the same vein as it does in dreamworld with Technician), Gyarados (Moxiedos sees barely any usage, but that probably has a lot to do with Intimidate being better), Toxicroak (it wouldn't hurt it, but it would lose its current niche), Jirachi, Celebi, Cloyster, Heatran, Venusaur
Not Made Better: Donphan (with 50 spd its only going to get any benefit out of it other than a slight boost to its weak ice shard if it runs some sort of rock polish set), Ferrothorn, Forretress, Latios, Gastrodon, Dugtrio, Latias, Skarmory, Ninetales, Politoed, Starmie, Tentacruel, Magnezone, Reuniclus, Rotom-W, Jolteon, Gengar, Espeon, Vaporeon, Jellicent, Volcarona, Alakazam, Blissey Chansey
That's at least 24 of the 50 members of the current OU who get pretty much no benefit from moxie and at most 26 who do. I don't see how a ratio like that speaks towards an ability that "can generally be slapped on any Pokémon and that Pokémon would be better for it." While I've come around on Quick Feet (since no one isn't helped by being immune to paralysis speed drops), I would make a similar argument for Guts, which I believe also benefits approximately the same OU pokemon (though Heatran at least would definitely fall to not made better since it can't use Status Orbs), but no one else nominated it and I appreciate that a two nomination threshold for voting on something is reasonable.