It is not known to evolve into or from any other Pokémon, but it is considered to be a counterpart of Sawk.
Throh is a bipedal, humanoid Pokémon with a bulky, red body and rocky skin. Its head is round and low on its shoulders with a T-shaped black feature that forms its nose and brow. Its hands and feet each have three digits, with its fingers being rounded. It wears a white judogi with a black, v-neck collar that extends down to its black belt. The gi has an integrate diamond pattern on its sleeves and a black, square patch on the bend of its knees.
Throh travel in packs containing five members. It weaves its black belt from vines and ties the belt to increase its power. It is driven to throw larger opponents and will always try to do so. This Pokémon is an all male species with no female counterpart.
Throh is based on a judo expert or judoka, and an oni.
According to interviews with Ken Sugimori in Nintendo Dream, in development, Sawk and Throh both had horns, making them look more like oni. However, they were replaced with eyebrows so as not to clash with Tornadus and Thundurus, who both were originally designed to be red and blue, like Throh and Sawk.
Throh is a corruption of throw.
Nageki is a combination of 投げる nageru (to throw) and 撃 geki (strike). It may also involve 鬼 ki (demon).
In other languages
From 投げる nageru and 撃 geki. May also involve 鬼 ki.