Ledian in depth
A ladybug standing upright
The design starts with a beetle: a ladybug with humanoid traits, articulated arms, and an upright stance. The fists at the end of each arm are what determine the rest of the creature, because they inspire both the Pokédex entries and the hidden Ability.
The English name is built from that of its pre-evolution plus the suffix -ian, and the Japanese does exactly the same thing: レディバ (Rediba) becomes レディアン (Redian). Neither strays from the original; it is a name of continuity, not reinvention.
There is a difference between the sexes that becomes apparent when you look at two specimens side by side: the female’s antennae are shorter than the male’s. It has no mechanical effect.
The joke of the four fists
The entire species is built around an idea that the game never manages to execute. The Pokédex says it fights with four arms and fists, its hidden Ability multiplies the power of punching moves, and its TM list gives it Focus Punch, Drain Punch, and Brick Break. Then it assigns it 35 points in Attack, the worst figure on its sheet. The result is a boxer with 110 Special Defense, which is like saying a boxer who only knows how to take a hit.
That contradiction is what sets it apart from other Bug Pokémon with a similar profile. Volbeat also has its Attack sunk, but its movepool never promised to hit hard; it is built to support from the start. Masquerain, the other Bug/Flying Pokémon with a special focus, at least puts its offensive stats on the side that suits it. Here, the distribution points one way and the tools point another.
Getting something out of 110 Special Defense
In a normal playthrough, its use is specific and limited. At level 12, it has Light Screen, Reflect, and Safeguard all at once, something almost no Pokémon available at that point can offer, and with 85 Speed it will usually set them up before taking a hit. Struggle Bug, at 24, covers the gap in its Bug-type attacks until Bug Buzz arrives fourteen levels later. Roost, at 20, lets it recover half its HP and get back on its feet.
What you need to internalise is when not to send it out. Against any Rock type, it won’t last a turn, and with Stealth Rock on the field every switch-in costs it half its health, so the cycle of coming in, setting up a screen, and leaving with U-turn runs out of steam on the second or third pass.
Absences
It does not appear in Scarlet and Violet, and it was not included in the Galar Pokédex either. It is a pattern repeated by several Bug Pokémon from the second generation: they survive in the remakes—it appears in Brilliant Diamond and Shining Pearl—and disappear from newer main-series releases. The Five Star Pokémon category and the sparkling powder are still there; the games where you can use it are getting fewer and fewer.