You don't.
it's just by luck
yes
It is not possible to catch Mew is Pokémon Emerald version without using cheats. The only way to get it would be to trade.
go to the old lady in battle tower in battle fonter and she make you enter codes.
Dive near sootopolis
You can either migrate it from Pokemon Emerald version, get it from trade, cheats, or events. :)
You can use Action rReplay for DS Lite for Pokémon Emerald version. Action Replay allows you to do various cheats.
well... to know the cheat in Pokemon emerald just watch a you tube just type this, how to cheat in Pokemon emerald..now just enter ..ok
emerald most definitely has more cheats
you only can get them with cheats (i realy hate that with all that events and cheats =[ )
turn on your vba+emerald and on the upp of the screen and click cheats then click cheat list and click gameshark type a name and the code