How do you catch Raikou in Pokemon Indigo?

Answer 1

Visit the burnt tower in Ecruteak city and go to the basement. The legendary trio will scatter. Now you must get a Pokemon (or many Pokemon) which know these moves:

Mean Look

False Swipe

(Any medium power move)

(Any move which puts the foe to sleep)

You have to have the Pokemon who knows Mean Look first in your party. Go to route 37. Raikou will most likely not be there already but each time you go under the arch to Ecruteak and back to 37 he moves. Keep on going back and forth till he is aligned with you on Route 37. Then go in the grass and start running. He should appear if you followed my other solutions. When he appears use Mean Look. He cant escape. Use a medium power move so his health is in far yellow or red. Then continue using false swipe. The good thing about false swipe is you cant kill them, it will always leave them with at least 1 hp! When Raikou has 1 hp use a move which will put him to sleep. Now use your best ball. Keep on using your best balls till you catch him. This strategy will work on Entei

Answer 2

In the Kanto gyms maps, it's on either cinnabar island or viridian town, i found 2, i only caught one because the second time i saw Raikou, didn't have any Master or Ultra Balls.