I'll tell you a good Crustle set to be used in OU:
Crustle @ Custap Berry
EVs: 252 Atk / 252 Spe
- Stealth Rock
- Stone Edge / Earthquake
With its good base 95 Attack and decent type coverage, Crustle makes for a fine lead. This Crustle generally works on hyper-offensive teams (remember Deoxys-D?) that need as many hazards as possible in order to sweep. Many people use Forretress or Skarmory over Crustle because of their Steel-typing and higher defenses. However, Crustle is actually capable of doing something else bar setting up Stealth Rock and Spikes. Crustle is the only lead SR/Spikes user capable of beating Starmie, threatening it with X-Scissor if it comes in and tries to spin. People paired Deoxys-D back in the day with Weavile because it could remove Starmie from the game. This Crustle also works well with Weavile as well as a Water-type resist such as Jellicent, who's also capable of spinblocking. However, if it's in the Custap Berry range, Crustle can simply annihilate Starmie with X-Scissor. In the last moveslot, Crustle can opt for Stone Edge for reliable STAB, or for Earthquake to OHKO Heatran, who completely walls Forretress and Skarmory (do watch out for Air Balloon variants, though).