Raikou is a quadrupedal, yellow, tiger-like Pokémon adorned with black stripes and a white underside. Its thin, light blue tail features sharp angles culminating in a spark-shaped tip. Most of its face is covered in thick, white fur, contrasting the shorter yellow fur around its red eyes. Raikou's muzzle forms a light blue "X," complemented by a black faceplate with two bumps that cover its forehead, nose, and ears. It possesses long fangs reminiscent of a saber-toothed cat. Each large claw converges to form a single point and remains perpetually exposed. Extra fur drapes over its body near the thighs, while a mane resembling dull purple rain clouds spans its back, enabling it to emit lightning bolts.
According to a proverb, Raikou descended from the sky alongside a lightning bolt. In Pokémon Ranger: Guardian Signs, it is depicted flying by generating storm clouds. In The Legend of Thunder!, Raikou exhibits distrust towards humans but may form bonds with those who assist it. This Pokémon tends to appear during thunderstorms or when other Electric-type Pokémon are threatened. Raikou embodies the speed of lightning and controls storm clouds at will. As it races across grasslands, its barks mimic thunder, sending shock waves through the air and shaking the ground. Raikou enjoys treats crafted by Snacksworth, who once raced up a mountain with it. Raging Bolt bears a resemblance to Raikou, believed by Occulture to be an ancestor.
The Sleep Style Dex mentions that while Raikou sleeps, its breath emits a rumbling sound akin to distant thunder. Upon awakening, it swiftly traverses lands with a roar similar to crashing thunder. Raikou relishes eating Raikou Biscuits and can be lured to a sleeping spot using Raikou Incense. It has three distinct sleep styles: Energy-Storing Sleep, Meditative Sleep, and Lightning Sleep.
(Source: Bulbapedia)
