There are 3; Raiku, Entei, & Suicune. They're at burned tower but they run away. And they travel around from Route to Route, so you may run into it. But it runs after 1 turn. There's also Lugia, but that's on the cover of your game, I think it'd be kinda obvious.
legendaries are good
No, you cannot go to Hoenn in Pokemon SoulSilver, but you can still get the Hoenn legendaries. Pokemon SoulSilver is a copy of Pokemon Silver, and you can only go to Johto and Kanto.
The legendaries on Soulsilver are as follows: Entei, Raikou, Suicune, Lugia, Ho-oh, Groudon, Latios, Rayquaza, Mewtwo, Moltres, Articuno, Zapdos. These are the legendaries found on Pokémon Soulsilver version. ~CareyPrice31FTW
Legendaries or Feraligatr, Ampharos, and Heracross.
There are no legendary in dark cave in soulsilver that i know of, but i know alot of legendaries and I could list some of them if you want.
More legendaries like Pokemon Heartgold and Soulsilver.
I don't think you really can. But in heartgold and soulsilver you will see vortexs in that game but no legendaries in them.
The cool legendaries you can get in Soulsilver/heartgold are the following: Lugia, Ho-oh, Raikou, Entei, Suicune, Articuno, Moltres, Zapdos, Mewtwo, Latias, Latios (Latios in Soulsilver & Latias in Heartgold), Kyogre, Groudon, Rayquaza (Kyogre in Heartgold, Groudon in Soulsilver & Rayquaza if you have both).
It's the same as any other game. Ditto+ Pokemon you want to duplicate (not legendaries)xthe Pokemon daycare= Egg. Hatch the egg and you either have a duplicate Pokemon OR the first evolution of that Pokemon.
the legendaries that are automatically in the game without events are as follows...HGenteiraikousuicuneho-ohlugiamewtwoarticunozapdosmoltresand kyogreSSenteiraikousuicunelugiaho-ohmewtwoarticunozapdosmoltresand groudon
I have put a link for your question. Most legendaries are obtained after beating all 16 gyms and defeating red.
Yes, I Think You Can! You need to trade a ditto from a heartgold or soulsilver. Or, you can go to palpark and migrate a ditto from silver or gold!