Scyther in depth
A verb written in katakana
Its Japanese name is ストライク, “Strike”, the English term copied as-is with no pun underneath. It does not mention the scythes: it talks about the impact, the hit that has already happened by the time you see it. The Western name does the exact opposite and looks only at the hands — scythe, plus the -er suffix that turns the tool into a profession. Between the two names, the whole species fits: speed on one side, cutting edge on the other.
The body is that of a praying mantis, with its raptorial front legs turned into blades. Not the head. Bulbapedia describes it as reptilian, and that is what separates this design from a natural-history insect copy: large, forward-facing eyes and a defined jaw. A real mantis hunts while still, waiting for prey to come close on its own. This one goes to it.
What each generation changed
In Red and Blue, Special Attack and Special Defense did not exist separately: there was a single Special stat, and its value was 55. It took special attacks just as poorly as it dealt them. The split in the second generation assigned it 80 Special Defense and left the 55 only for attacking, a quiet adjustment that removed its worst flaw without changing the total.
The fourth generation added Technician as a second ability, and the fifth gave it Steadfast as its hidden ability. As for where to find it, the Safari Zone housed it in the first and third generations, while in the second it entered the Bug-Catching Contest in the National Park, where many players saw it for the first time.
Two exits for the same bug
Neither of its evolutions can be reached by playing alone and levelling up, and the two were designed at very different points in the series. Scizor appeared in the second generation through a trade with a Metal Coat, and replaces Flying with Steel. That change fixes exactly the point Scyther struggles with most, because Steel resists Rock and the quadruple weakness disappears; the price is losing Speed and opening up a huge hole against Fire.
Kleavor arrived with Pokémon Legends: Arceus and works the other way around. Black Augurite turns the flying bug into a rock bug, with stone axes instead of scythes, and shifts the design reference from the mantis to a flint tool. It is the only one of the three forms that neither flies nor looks as though it could.
The playthrough from level 8
False Swipe, at level 8, is the real reason to bring it early: it leaves the opponent at 1 HP without knocking it out, and with 105 Speed it almost always moves first. A low-level specimen turns any difficult catch into a formality, and that is worth more in a normal playthrough than half its offensive movepool.
Then comes its best run. Slash, at 24, has a high critical-hit ratio; Focus Energy, at 28, raises that ratio; Night Slash, which only comes from an egg, shares the property. Chained together, they build a critical-hit strategy that ignores the opponent’s Defense boosts.
The bad part is at the end of the list. Swords Dance does not appear until 44, when most playthroughs have already passed through the League, and Agility, at 32, is redundant on a Pokémon that already comes fast out of the box. The stretch between X-Scissor, at 40, and those two support moves is pure filler.