Although Scyther are divided into "male" and "female", these classifications have little to do with their actual reproductive roles; they are a convenience for trainers, nothing more. Scyther are true hermaphrodites, and whether they take a male or female role when mating depends on their performance in the bizarre, deadly mating ritual of the species.
When two Scyther are ready to mate, they face off against each other, bow, and begin to fight. Some onlookers have compared it to a pokemon battle, but it is not a true battle: no matter what techniques they know, or how great the danger facing them, they will use no weapons save for their large scythe hands. Poets have titled it a dance or whirlwind of blades, and this is a far more apt description: indeed, scientists believe that their hands evolved into these large blades precisely because of this ritual.
They will continue battling until one Scyther is defeated, typically by (literal) disarmament. At this point, the victor embraces the loser, cutting deeply into its sides while its body absorbs the loser's genetic material until the defeated Scyther is sliced in half. The victor then proceeds to eat the body of the deceased, a nutrient-rich corpse which provides the energy needed to spawn many larvae and raise the next generation.