Thought to be one of the first Pokémon to live in harmony with humans, it has a placid disposition.
(From Bulbapedia)Skiddo is a quadrupedal, goat-like Pokémon. This Pokémon has a white face with a brown blaze going down its muzzle. The blaze ends at a round, black nose, and it has black, elliptical eyes. The back of its head and its ears are also brown, and it has a short, white beard. Skiddo has two short, black horns on its head. Both of these horns extend in opposite directions out to the sides, and they have dark rings around the middle. There is a leafy green mane around its neck that extends along its back. The mane ends at its tail, which is made up of three short leaves. Its body is primarily brown with white stockings on its legs. Each foot ends in a cloven, brownish-orange hoof.
Due to its close relationship with humans, Skiddo has developed the ability to read the feelings of its riders through their grip on its horns. Skiddo typically has a gentle nature and is said to be the first Pokémon to live alongside humans. Because of this relationship, Skiddo doesn't mind carrying people or supplies on its back.
(From Bulbapedia) Skiddo is based on a goat kid, possibly a bharal or dwarf bharal due to its horns. It is also based on a bike, as it can be ridden and has riser bar-like horns. The grass that grows upon it may originate from Pan or Faunus, gods of nature who are half-goat, half-human. The grass could also be a reference to the traditional yule goat figures in northern Europe made of hay.
(From Bulbapedia)Skiddo may be a combination of skid and kiddo (slang for kid, which is also a term used for young goats.). However, the way it is pronounced in the anime implies it may be a corruption of the Ski-Doo brand.