This is the easiest way to catch them. all you have to do is get the masterball then duplicate it BEFORE catching suicune. catch suicune then go into the little patch of grass below ecruteak. no need to jump over any ledges or anything. use sweet scent in the grass and it will be a 74% chance of encountering entei. then once you've caught that, go to the left of ecruteak city and go into the grass there. my little sister was actually playing it at the time and she encountered raikou with out using sweet scent! i caught it and now I'm happy coz i caught ho-oh.
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yes if you can find them
Yes, Raikou is one of three legendary dogs which specify in Gold, Silver and Crystal. The others are Entei, a fire type, and Suicune, a water type.
suicune is top legendary dog just play Pokemon crystal and you'll see.
I don't think you can refight any legendary Pokemon except the wandering dogs.
You can get lugia, ho oh, entei, suicune and raikou