Through an action replay cheat system.
In Pokemon Soul silver or silver or gold, the legendaries you can get is Lugia, Suicune, Entai, Raikou, Mew and Mew 2
mystery gift
you cant you have to trade
Mewtwo is in cerulean cave, and you can only get Mew through an event.
Yes mew two is on soul silver you just need to look in cereleun cave
Nintendo event or action replay
Mew.
You cannot catch a mew. You can only get it through events or cheats.
You can't find mew without an event. Sorry.
You get him in trade with a friend or you do the event that past already.
use a action replay or you don't get it
You can't, you must trade from Emerald (which had an event to get to Mew), or trade from Pokemon Ranch (if you unlocked it).