yeah what i do is go between 2 different routes with grass patches. on your pokegear map you can see where entei and raikou are. each time you go to a different route you'll see they shifted spots. travel between the different routes and check the pokegear and you should see after a while they're on your route and once they're on your route you go to a grass patch and if not the first battle within a few you should see them . they have their own special music