Raikou (ライコウ, Raikō) is a fictional creature in the Pokémon media franchise.
 As a Poké Ball Pokémon
Raikou is treated as a "legendary" Poké Ball Pokémon; its chance of appearing is much rarer than most of the others, and in return its effect is more powerful. Raikou uses Thunder as its attack. A current of electricity will form around Raikou. Any character (other than the summoner) that makes contact with the ground within the current of electricity will take damage and be thrown a short distance up into the air, similar to Venusaur's Earthquake, though more powerful and in a much larger area.
 As a trophy
Raikou features as a collectible trophy, unlocked as one of the 100+ trophies that can be collected randomly during normal play, such as in the Trophy Lottery and throughout the various Single-player Regular Matches. It reads as follows:
These Thunder Pokémon travel near and far, blasting out electrified whirlwinds. They carry storm clouds on their backs, so they can produce lightning regardless of the local weather; it's even said that they descended to the earth with via lightning bolts. Their extreme quickness lends itself to flight, so they're very hard to capture. (Pokémon Gold & Silver 10/00)