This is how it works:
Gallade
Adamant Nature
EVs: 6HP 252 Attack 252 Speed (ultimate EV spread)
Item: Razor Claw
Attacks:
Close Combat
Psycho Cut
Night Slash/Leaf Blade
Stone Edge/Leaf Blade
Razor Claw: This item boosts Crit Hit ratio by one level. The attacks Psycho Cut, Night Slash...