Well, if you are running Adamant, then the obviosu choice is to fully train in attack EVs (252 EVs). The second lot of EVs realy depends on the given set. However, I prefer bulky, becuase without choice scarf it really isn't out speeding much.
Craindos @ Evilote / Life Orb
Trait: Mold Breaker
Admandt Nature
Evs: 252 Atk / 252 HP / 4 Sdef
- Head Smash / stone edge
- Zen Headbutt
- Earthquake
- Pursuit
This set makes Crain very bulky. That means it an survive a very large amount of hits before hitting back with an immesncely powerful Head smash. If you hate the recoil, Stone edge gives a good power alternative, but still nto as much as head mash. It also has a higher chance of missing.
Hope I helped xD