Kingler in depth
Two crabs in the same body
The design does not come from one species but two, and it shows in which part of the body each one contributes. The asymmetry is that of the fiddler crab, which uses its oversized claw to signal and fight, never to eat. The size, spines and colour come from the king crab. The English name joins both ideas with “king” at the front, making it clear which of the two is in charge. In Japanese it is called exactly the same thing, キングラー, which is unusual in a generation where almost every name was reworked when it crossed the Pacific.
Making the asymmetry a defect rather than a strength is what sets it apart from the rest of the first generation. Here, the weapon weighs too much, tires out the Pokémon carrying it and gets in the way when there is nobody to hit.
Crabhammer was its move for two generations
Until Generation III, only two Pokémon learned Crabhammer: Krabby and Kingler. It was not officially declared a signature move, but it functioned as one, and it was the only thing the line had exclusively to itself. With Crawdaunt and later crustaceans, that privilege ended. Today it gets the move at level 54 and it is still its best level-up attack, but it no longer says anything about Kingler.
The form that only exists in Galar
In Sword and Shield it has a Gigantamax form, and the change goes in the expected direction: the claw grows until it dominates the entire silhouette, foam spills from its mouth and the white of its eye turns red. It is the only Pokémon that can use its Water-type G-Max move, a fact that sounds better than it performs, because that form only works in battles in those games. Outside them, its stat distribution and movepool have been practically the same since 1996.
Kanto's other shell
Compared with Cloyster, the distribution is inverted. Cloyster piles Defense up to absurd levels and leaves Attack as an afterthought; here, Defense stops at 115 and the points go into 130 Attack. Both carry the same underlying problem, low HP that leaves the shell with very little to protect.
In a normal playthrough, the practical difference is timing. It reaches level 28, right when the water routes open up, and by then it already hits hard enough that it does not need anything multiplied for it. Swords Dance does not appear until 48. Twenty levels between having the attack and having a way to double it, and that gap is where it is decided whether it ends up on the team or in the box: anyone who catches it early will have a solid physical attacker for the whole middle of the game, while anyone who gets to it late will find a Pokémon that can no longer keep pace with anything.