Mewtwo, yes, if you have a FireRed or LeafGreen with Mewtwo.
You have to have two Game Boy Advances to trade with emerald and ruby and a GBA to GBA link cable, another way to trade is if you use a GCN (gamecube) to GBA cable and you use Pokemon colosseum or Pokemon xd gale of darkness to trade emerald or ruby Pokemon to there then use colosseum or xd gale of darkness to trade your emerald or ruby Pokemon to the other game either ruby or emerald. Theres no way you can use a DS to trade with GBA games because the DS is not compatible with the GBA link cable.
Since Mew is a legendary pokemon, it does not have a gender, so you cannot hatch an egg. If you want a Mew, you have to use an action replay code or trade it from another game.
Pokemon 2000
You can't you can only get mew two but that's just me.
if you have Mew on a game boy Pokemon game migerate it to platinum and than go to the pal park.
trade
You cannot catch Mew in "Pokémon Ruby."or you can get mew-two in fire red or leaf green.
trade
You have to trade it from RBY
get the ruby and sapphire
train your Pokemon or battle and trade with freinds.
You can't. You will have to either a) Migrate from Pokemon Emerald, Ruby, Fire red or leaf green or b) Hack or trade with someone who has done so. B)
You'll need Pokemon ruby. If you mean ruby to sapphire, then you'll need both games, two gba's, and a link cable.
you cant get a mewtwo but you can get it if you trade
You can't get mew and mew2 on ruby. You can get them on leaf green. In ruby you can get rayqazza and groudon. i think you can get mews data in your pokedex to trade trhough the old sea map and be able to request it on trades you'll need a wireless adapter though ;P
There is only two ways to obtain Mew in Pokemon Fire red. 1. Use a cheatcode 2. Trade Mew from the Pokemon game called Emerald.
no because there isn't a mew-three just mew and mew-two sorry