you cant unless you use action reply
You can't catch it but only by Nintendo events or cheats.
not thru normal gameplay,but if you have platinum pearl or diamond you can get one feb 27 2010 thru may 12 at gamestop
I don't think you can.
Umm.. You Might need to migrate from Pokemon emerald
upload from a gba event.
You can't get Jarachi in ruby, sapphire, and emerald. It can only be obtained with a gameshark, action replay, another cheat device, or a Nintendo event and there hasn't been one since 2002 as far as I know.
kyogre, groudon, raquaza, jarachi (I think), deoxys (I think), latios, latias, the three reggies (regigigas couldn't be caught) and some more. I think.
you need a action replay or a Pokemon event
You can get it from an event which you can't anymore, from the Pokemon Collosseum Bonus Disk, or from the Pokemon Channel.
i just started but there might be ... with Acton replay
The only event Pokemon for Emerald are Jarachi Deoxys Celebi and Mew, although these Pokemon are not nessarry for the game to reconize a complete Pokedex