Archeops is a large, ancient avian flying Pokémon. It possesses traits of both birds and reptiles. Its head is snake-like in appearance; it is featherless, scaly, and red with a green stripe running along the top. Its mouth is lined with sharp fangs. Its eyes are round white with black pupils. Its body is covered with frayed yellowish feathers with blue feathers on its winglike arms and legs. All of its winglike limbs bear razor-sharp claws. It has a ring of small green feathers on its ankles. Its tail is red and featherless; it has a fan of blue feathers at the tip.
Archeops are naturally erratic creatures, being almost untameable even by non-legendary Pokémon standards. However it can understand a Trainer's commands, when it has settled down that is.