No it doesn't exist.
you cant unless you got it from Pokemon emerald Sapphire or ruby or cheating
you have to migrate it from ruby,sapphire,emerald,fire red, or leaf green
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
you buy an gameshark then you catch him in emaerald or ruby or sapphire then you transfer him to diamond
give him the ruby on island six, then you can catch mew and mewtwo
You can't catch it. You must transfer it with Pal park from your Pokemon emerald ruby or Sapphire.
there no cheat to catch mew in pokemon ruby
DEOXYS and Mew are not Available for Emerald, Sapphire or Ruby. These Pokemon are not available for any game, though two events were available for Deoxys, though Mew may have an Event for SoulSilver and HeartGold soon.Oh yeah, Subscribe to me on Youtube, my Username is KatKastle!!
You need to get to Faraway island, which you need a Nintendo event to get to. See ya!!
You have to upload it from FireRed, LeafGreen, Ruby, Sapphire, or Emerald.
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 :-)