You should also try not to enter and exit buildings as both of these actions cause Raikou to change the route it is on. Since you cannot encounter the legendary Pokemon inside a building, it may pass by you without you being able to encounter it.
Moves such as Sweet Scent do not tend to attract Raikou more than any other Pokemon. The best solution to encountering Raikou would be to track it carefully and approach it in the Route it is likely to travel to next.
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You can get lugia, ho oh, entei, suicune and raikou
Roaming pokemon like entei raikou are everywere,just chec your pokegear.
Using a master ball
the legendaries available in Crystal is Raikou, Entei and Suicune. Lugia and Ho-oh are available too.
Raikou is everywhere. After you find it in the Burned Tower, it'll roam Johto.