You can't get mew in firered or leafgreen.
No you caan only send it from firered or leafgreen
Mewtwo? Plus you cannot get Mew in Leafgreen or Firered.
You can't catch it at Pokemon Pearl, you'll have to Transfer it from LeafGreen/FireRed or trade it with SoulSilver/HeartGold
no because there isn't a mew-three just mew and mew-two sorry
You can't catch mew on leafgreen you need gameshark codes for that
You have to upload it from FireRed, LeafGreen, Ruby, Sapphire, or Emerald.
Yes, Mewtwo can be caught in Cerulean Cave. As far as Mew is concerned, only hints about it's existence can be found in the Pokémon Mansion at Cinnabar Island. There is no way to catch Mew in Pokemon FireRed of LeafGreen. You have to trade it.
In Pokemon Red, Blue, and Yellow you are able to catch Mew through a glitch. Mew is available in other games such as FireRed and LeafGreen, but it was an event Pokemon. The event it over, and all you can do is wait for a future event, or trade with someone who has Mew.
Mewtwo, yes, if you have a FireRed or LeafGreen with Mewtwo.
There is no Mew in FireRed or LeafGreen.
It isn't possible to catch mew in Pokemon diamond. You need an action replay cheat cartridge.
The only legitimate way to obtain Celebi and Mew is through a Nintendo event. In FireRed and LeafGreen you will need an event-only item to travel to the last two islands where you can catch those Pokemon