By trading, catching, and raising pokemon. It will take some time.
That is really quite simple. All you have to do is breed a Hitmonchan or a Hitmonlee in Pokemon FireRed or LeafGreen and trade it on to Pokemon Emerald.
Action Replay.
get all the Pokemon in the emerald dex
you cant because you always have to have one in your party and migrating all of the Pokemon in your box would be really dumb.
emerald has all the Pokemon
Go to this link for all you need to know and its a great site for all Pokemon info and its not some stupid website its really good http://www.psypokes.com/emerald/legendaries.php
200 Pokemon is all the emerald Pokemon to get more beat elite four and get national dex
You cannot get all 202 Pokemon just on emerald because there are Pokemon that are only obtainable in either Sapphire or emerald, but when you trade on emerald it will update your pokedex to national mode.
No unless you are realy good at the game!:)
You have to have a mach bike and then you go really fast through all the cracks, but don't slow down. To gain speed fast press B. To turn, press the arrow keys very fast so you dont miss the turn.
To get all the Pokemon quickly, you have to do the most detestable thing: cheat.
In Emerald, Pokemon can be found in Grass, Water, and Caves. There are 385 Pokemon in total.