If Raikou faints, go to the Burned Tower . Then you see him. Same as the other legendary dogs however Raikou will only regenerate if you defeat the Elite 4 and Lance, once you have caught Raikou, it will no longer regenerate.
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After you beat the elite 4 again raikou starts roaming again.
Sorry to rain on your parade, you can't get it on soulsiver. sorry! :) -pokeman
Quit posting that stuff no one on this website know about pokeman
Pokemon HeartGold and SoulSilver.
you can but,either you need an AR or just have some luck.