Use the master ball you get from profe elm
There are 5. Entei, Suicune, Raikou, Ho-oh, and Lugia.
You catch them with a ultra ball
no.
you must die
5
No No
it helps you go back in your game if you didn't catch a legendary Pokemon
over 9000
yes you can also catch them in soul silver.
no it's not possible to catch rayquaza in silver but if it is a hacked version you can catch it
You can catch Lugia, and evolve Growlithe into Aracanine, which is not considered legendary, but literally has the title of Legendary Pokemon. Hope this helps!
Zapdos is a flying/electric type Pokémon. It is one of the legendary birds of Kanto. The only way to get one in Silver version is to trade.