Chesnaught are bipedal, mammalian Pokémon with some plant-like features. They possess a prominent domed, armor-like shell similar to that of a chestnut. The armor is pale beige in coloration with four large spines jutting out of the back. It has a trim around the edge consisting of red and green bands, with the green on the outermost edge. There is an additional spine protruding from the armor over each of Chesnaught's shoulders, which are connected by a green breastplate. Their bodies are colored similarly to the shell, and their long limbs and tail are banded with plates of armor. The top surfaces of the tail and arms are protected by green armor, and the arms have two small spines. They have three brown, clawed digits on their hands and feet. Interestingly, its hands can fuse together to create a spike-covered "shield". Chesnaught have fluffy white fur on their bellies and fringing their faces like a beard. They have a small, pink nose with a three-pointed patch of brown fur extending up their short snouts. They also have four pointed teeth and a plate of beige armor atop their heads, similar to a helmet.
Chesnaught is renowned for its tank-like body; it is capable of throwing a Tackle that can flip a 50-ton truck. Once it gets into its defensive stance with its hands covering its face, it can stand up to a bomb's explosion. It will not hesitate to use its sturdy body to shield its allies from danger. Chesnaught is the only known Pokémon capable of learning Spiky Shield.
- Chesnaught has the highest base Defense of all fully evolved starter Pokémon.
- Chesnaught is the only Fighting-type starter Pokémon whose primary type is not Fire-type.
Origin
Chesnaught seems to be based on a hedgehog combined with a matured chestnut. Its bulky "armor" is possibly a reference to split apart calybium and cupule, which are parts that protect the nuts of chestnut trees which split apart when sufficiently ripened. It is also based on knights and various types of body armor, including brigandines and barbutes.
Name origin
Chesnaught may be a combination of chestnut and juggernaut, knight, or dreadnaught.
Brigarron may be a combination of brigandine and marron (French for chestnut) or baron.