You can only get Mew through special Nintendo events, and you cannot breed it either, I got mine from an event at Toys R' Us, you just have to keep your eyes open and look for an event.
If you went to an event you could.
but now the only way to get mew is through a hacking device
EG. GameShark, action replay
Mew is one of the many Pokemon that does not evolve
Mew is not available in Pokemon Sapphire through normal game play. You must use a GameShark with a hacking code to get Mew.
There is no possible way to get a Mew in Ruby or Sapphire. The only way to get one is from Nintendo events.
you can not
You just cant
You cannot catch Mew or Celebi in the wild, for they are event-only Pokemon. Events for Black 2 and White 2 or previous games are no longer distributed, so an Action Replay or a GameShark will be required to encounter these Pokemon in the wild. (Do not encounter Mew in the wild in Pokemon FireRed, LeafGreen, Sapphire, Ruby, and Emerald, (Unless in Faraway Island) for it is programmed to not obey, regardless of how many Gym Badges the player earned.) Mew is an exception for 2 ways. You can perform the "Mew Glitch" in Pokemon Yellow to find it east of Lavender Town or you can have 999 Pokemon in your Pokemon Farm to get Mew from Hailey. Celebi can be found doing the "Celebi Glitch" in Pokemon Gold, but it is a lot more risky and harder than the Mew glitch mentioned above. You may want to research these glitches to get the accurate answer.
There is no mew in sapphire.
inposibal
No
you have to trade with pro oak a mew
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!!
mew