You'll find Entei in the Burned Tower with Raikou and Suicune but when you see them run off, they will be roaming around the Jotho region. Just keep traveling until you see one of them.
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You can't find Mew in Pokémon Silver.
The Shiny Suicune was a game stop event held before Pokemon black and whiter where releases. You had to get either suicune riakou or entei at the event of your Pokemon Pearl/diamond/platinum/soul silver/ or heart gold version, and then transfer them to your Pokemon black/white version.
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.
to get the sun stone in Pokemon silver version you have to place first in the bug catching contest which takes place on Tuesday's and Thursday's just south of goldenrod
Suicune is in a set location, and the story will lead you along to find it. Entei and Raikou are roaming around all the time. You can see them on the map, but everytime you enter a new route, or go in your bag or pokemon, they will move. So it's tricky.