Name Origin
Raikou could be taken to mean 雷光 raikou (lightning), which is also the inspiration for the name of raijū, or it may be a combination of 雷 rai (thunder) and 皇 kō (emperor). It may also derive from 雷公 raikō (thunder duke), identical to the name of the Taoist deity Lei Gong.
Origin
Raikou is particularly based on the Thunder and Lightning gods of most cultures surrounding the world, mostly the 雷獣 raijū, a thunder demon of Japanese lore. It is said to be a creature that could take the form of a tiger, monkey, blue wolf wrapped in lightning, and many other animals. Raikou is specifically based on its tiger form, while the Pokémon Manectric is based on its wolf form. In terms of physical build, Raikou is based on the Smilodon fatalis, a well-known but extinct species of wildcat often referred to as a saber-toothed tiger. Its color and pattern scheme are reminiscent of that of a Bengal Tiger. The stripes that decorate Raikou's body also can be compared to zigzagging thunderbolts and perhaps even scars from claws. The white ruff around Raikou's face is akin to the Siberian Tiger's thick fur around its neck. In the anime, Raikou is shown to be very agile, swift, stealthy, and a powerful attacker, just like a tiger. The gray "plate" atop its head may be similar to Entei's head ornament, being either a helmet or crown that signifies courage and power. The flowing purple mane on its back is likely meant to invoke the image of a cumulonimbus cloud, the cloud type most often associated with thunderstorms.
The lighting that ignited the flames of the Brass Tower...