Iron Jugulis is a three-headed, mechanical, draconic Pokémon with six thin, pointed black wings with visible joints. Its body is primarily dark blue, with black armor plating resembling fur covering its necks and shoulders. The inner armor surrounding its heads is fuchsia in color with white spots, and resembles collars. The surfaces of Iron Jugulis' heads function as LED displays. When turned on, each of its heads glows blue with black eyes; the main head additionally has fuchsia pupils and visible pointed teeth formed from its armor plates. Like with the eyes of other future Paradox Pokémon, Iron Jugulis' LED faces are used to display its emotions; unlike with Hydreigon, its secondary heads can emote in this manner as well. When Iron Jugulis falls asleep, its heads turn off and become a solid, featureless black. Its abdomen has two fuchsia stripes and its feet resemble fins. Its tail also sports a fuchsia stripe and ends with a black plate.
An article from a July issue of Occulture magazine describes Iron Jugulis as a flying life-form resembling Hydreigon that has allegedly been seen in a certain corner of Paldea. It was reported to have razed an entire building with a high-energy blast before flying off as if to find its next objective. Iron Jugulis is theorized to be a sort of machine-Hydreigon hybrid, as it combines Hydreigon's ferocity with the ruthlessness of a machine. It is said that it takes its name from a similarly described entity in the Violet Book.
Iron Jugulis is based on Hydreigon. By extension, it is also likely based on Yamata no Orochi or other many-headed antagonistic dragons or serpents in various mythologies, such as the Lernaean Hydra, Zahhak, or the Yelbeghen. The panels around its heads resemble LED displays.
Iron Jugulis is literally iron jugulis (with jugulis being derived from the Latin word jugulum, meaning throat or neck).
Tetsunokoube can be taken literally as 鉄の首 tetsu no kōbe (iron head).