For Pokemon Silver the main legendary Pokemon you can capture is Lugia, which you need a Silver Feather for it (It should be given to you after you save Goldenrod City from Team Rocket) Lugia is in the Whirl Islands at level 40, so better you not use a masterball.
Ho-oh is a legendary Pokemon which you need a Rainbow Feather for it (You get it a bit after you get the silver feather) I'm not sure when but Ho-oh is in the Sacred Tower in the city you get your fourth badge, the ghost-type gym leader, Ho-oh is lv 70 .
Entie, Raikou and Sucine are all level 40 and they're all wild so you can randomly run into them but they wont fight, expect maybe Sucine. They will run but if you weaken them, they will have that amount of health when you see them again. For Sucine, at one point of the game you have to either capture it or defeat it. I suggest catching it and trading it into another game that you have, instead of defeating it.
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The story line in crystal is a little longer and you encounter the legendary Pokemon in a different order than gold and silver. The mascot in Crystal is Suicune, one of the three legendary dogs, and can be caught in the Bell Tower after many encounters in the region. Gold and Silver's mascots are Ho-Oh, the guardian of the skies, and Lugia, the guardian of the seas. There are also some differences in the wild Pokemon. An example is in Gold, you can find Spinarak, while in Silver, you can find Ladyba.
not if you have it from youtube that was a fake video
You can play Pokemon silver version on any of the gameboys,but not on the ds.
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There are 3 ... you can get the Legendary Bird Pokemon ( HO-OH ) you can find it at the ten tower ... you must have a rainbow wing to enter the tower. but the other 2 Legendary Pokemon i don't think you can get them.