you can't. raikou is a generation 2 Pokemon. Pokemon blue is a generation 1 game. so it is impossible!
Entei, Suicune and Raikou
Battle him again.
raikou cannot be caught on Pokemon ruby
to catch Pokemon you have to obtain raikou palls
Raikou is only found in firered and leafgreen if you chose squirtle as your starter Pokemon. Or you can get the purified raikou from Pokemon colosseum.
You can't find raikou in ruby.
You cant get raikou in Pokemon diamond or Pokemon pearl.But you can get him in a gba Pokemon game and transfer him to your Pokemon pearl or diamond!
Raikou isn't on Pokemon Pearl, if you want it you must transfer it from another game
You go to a mountain and catch raikou
raikou is better
You cannot catch Raikou in Pokemon Diamond and Pearl. To get Raikou in Pokemon Diamond and Pearl, you must trade for one from Pokemon HeartGold and SoulSilver where it can be caught or transferring from Pokemon FireRed and LeafGreen.
The legendary pokemon Raikou is based off of a tiger :D I effin love pokemon