You need to have beaten the elite 4, and fixed the machine on one island. Then go in the cave a little west of Cerulean. You need surf to get there and at the end you'll encounter Mewtwo.
Mewtwo, yes, if you have a FireRed or LeafGreen with Mewtwo.
Capture Entei/Raikou/Suicune.
Nope, you have to trade him.
go to the special event
You can't catch it on Firered you can only catch it in Emerald
Mew cannot be found in firered only emerald can via Nintendo event.
There is no Mew in FireRed or LeafGreen.
The only way to obtain Mew was through an event for FireRed/LeafGreen.
You cannot get Mew legit in Pokemon FireRed, for the event for Mew has ended. You would need to use a GameShark or trade for it from Pokemon Emerald.
sadly,no
The Cerulean Cave
There no Mew in firered.
Mew two sould be at the end of the cave in cerulean city after you beat the elite 4.
Mew-two Is In Cerulean Cave In The Bottom You Have To Work Your Way Down And You Will Find A Level 70 Mew-two ........ Bring Strength & Rock Smash To Get To Mew-two and Then When You Find Him Save And Catch Him ( You Save Before Just IN Case You Accidentally Kill Him You Can Re DO It ) (good Luck)
Mewtwo, yes, if you have a FireRed or LeafGreen with Mewtwo.
You must capture Mew on Emerald and trade it to FireRed.
you don't. You can't find either Mew or Mewtwo in Emerald; you have to trade from FireRed or LeafGreen to get Mewtwo. You can't get Mew without an event or cheating.