Zweilous (Japanese: ジヘッド Dihead) is a dual-type Dark/Dragon Pokémon. It evolves from Deino starting at level 50 and evolves into Hydreigon starting at level 64.
Zweilous is a quadruped Pokémon that has muscular front legs with two claws on each foot, but rear legs that are less defined and have two small, backward-pointing toes without claws. Zweilous's fur is a gray-black while the body is a dark blue. There are tufts of fur over two heads with rounded points at the top, and Zweilous appears to have no eyes. There are two thin wings on the black section. Each wing ends in two points. The fur stops at the chests and opens up to fuschia-colored striped bands on the side of Zweilous's legs. It is unknown if Zweilous is blind, like its pre-evolution.