Not entirely true, X-Scizor.
In a select few games, Sableye is a good temporary choice for your team.
In Sapphire, Emerald, and Alpha Sapphire (you can't find it in Ruby or Omega Ruby, you get Mawile instead), Sableye can be found in Granite Cave. Now, granted, its base stats are no higher than 75, but at around level 10-12 when you catch it, that's super nice. It comes with Night Shade, which at point of capture will do more damage than most (if not all) of your team's other attacks.
But that's not what makes it so sought after - it's immune to everything in Brawly's Fighting-type Gym in Dewford Town. That's what makes you able to so easily walk over him and not break a single drop of sweat in that part of the game. Also, a lot of the moves in the early part of the game are just Normal-type, which it's immune to. Even up to Lavaridge Town, all you have to do is run Flannery's damn Torkoal out of Overheats and you can wall it to death because the only other move it gets is Body Slam. (This doesn't work in AS, I think it knows Flame Burst or something.)
As you get past the fifth gym (Petalburg City, which has an easier time beating Sableye than you might expect), Sableye's ingame viability starts to wane and I start to look for other options, mostly because of reasons X-Scizor already explained.
