escavalier

Pokémon #589 in the National PokéDex, a dual type Bug/Steel Pokémon.
Escavalier is an insectoid Pokémon with a head sporting the red horsehair crest of a knight’s helmet, with a visor underneath it. Its shoulders have large, round metal ridges, from which its thin black arms extend. The arms are tipped with red-striped protrusions resembling jousting lances. Its face and torso are bare of armor, but its lower body is concealed within a swirled gray shell with a red spike on the underside, which was presumably the shell of a Shelmet.

It evolves from Karrablast if traded for a Shelmet. Shelmet will also evolve into Accelgor then.
If only one is holding an Everstone during the trade, neither will evolve.
Japanese Name: Chevargo

Prior Pokémon: Karrablast
Next Pokémon: Foongus