Razor Claw: When this item is held by a Pokémon, the holder's Critical Hit ratio is raised by 1 stage.
Super luck: Super Luck enables the user to critical hit twice as often as normal. The critical hit multiplier is applied before critical hit bonuses from items, so item modifiers are not doubled.
Razor Claw + Super Luck + Crit move (Night Slash, Air Cutter, ETC.) = +3
Stage Percentage of critical hit
Ways to increase critical chance
Scope Lens = +1
Dire Hit = +1
Using move with high critical-hit = +1
Lansat Berry = +1
Stick (Farfetch'd) = +1
Lucky Punch (Chansey) = +1