Tyrantrum is a large, dinosaurian Pokémon, closely resembling theropods like Tyrannosaurus. It is predominantly brick-red in coloration, with scaly patterns on its skin and scattered orange highlights on some of the scales and ridges. The underbelly is gray with white borders, and it has a long tail with two orange spikes near the tip. Its small forelimbs have only two black clawed digits, but it has powerful hind legs with three sharp, black talons. Plated, armor-like ridges are found on the front of the legs and down the back and tail. Spiky, white "fluff", similar to the primitive feathers on many dinosaurs, extends into a cape-like fringe around the neck. Additional feathering forms a prominent beard on the lower jaw, which is otherwise gray in coloration. Its head is proportionally large, with a ridged snout and powerful jaws. The lower jaw is lined with razor-sharp teeth, and the upper jaw features a number of tooth-like projections which are also highlighted orange. Its eyes appear to have black sclerae with white irises. An orange, five-pointed crest extends from the snout above the eyes and point backwards, giving it the appearance of wearing a crown.
Before its extinction, wild Tyrantrum used to live a 100 million years ago, when its strong jaw conferred it status as an unmatched predator.
Origin
Tyrantrum seems to be based on a Tyrannosaurus or possibly an Allosaurus.
Name origin
Tyrantrum may be a combination of Tyrannosaurus, tyrant, and tantrum.
Gachigoras may be a combination of ガチン gachin (banging noise) or ガチガチ gachigachi (teeth chattering), チゴラス Chigorasu (Tyrunt's Japanese name), and Tyrannosaurus.