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you don't. You can't find either Mew or Mewtwo in Emerald; you have to trade from FireRed or LeafGreen to get Mewtwo. You can't get Mew without an event or cheating.
You can neither trade from FireRed/LeafGreen to Emerald or using Cheat device.. After all Lapras not wild in Pokemon emerald..
You don't not unless you trade or cheat
You can use a cheat device like an action replay and hack it or you can get it using a event. but if you don't want to cheat or wait for a event you can go on certain websites and trade with people they will trade for just about anything :)
You cannot get all 3 Starter Pokemon in Pokemon Emerald without trading for the other 2.