You need to trade Mew from Emerald
there no cheat to catch mew in pokemon ruby
You cannot catch Mew in "Pokémon Ruby."or you can get mew-two in fire red or leaf green.
you cant
as i know, in Pokemon emerald, ruby and sphere
Only if you have a code breaker and the master code for ruby plus the mew and mewtwo code
you buy an gameshark then you catch him in emaerald or ruby or sapphire then you transfer him to diamond
the Unobtainable Pokemon in RSEFRLG are Celebi, Mew, Jirachi, Deoxys, and 000 (Missingno. ( DO NOT ATTEMPT TO CATCH))
you didn´t get mew qith any cheats in ruby =( you can get mew with an mew-glitch in yellow (blue,red) or you can get a mew from my Pokemon ranch for diamant perl and platin but not for ruby the way to get mew in ruby is ... on a Pokemon tour (Pokemon-day ... , ) or with an cheat ... i hope i can help you :-)
You can catch Groudon,Rayquaza,Latios,Deoxys,Celebi,Jirachi,regiice,regirock,registeel,and Mew
give him the ruby on island six, then you can catch mew and mewtwo
Mew is an event Pokémon, so you can't catch it in Ruby. If you want it, you will have to trade for it, or attend an event where they give them out. Serebii.net keeps track on currrent and upcoming events.
You can't in ruby.