Mew 3 doesn't exist and the only Mew-anything you can find is mew2 at the back of Cerulean Cave.
You can't get mew3 in Pokemon FireRed. It is a fan-created hack, and can't be obtained in any of the legitimate games.
You Can't Get Mew3 In Any Game Unless Its One Of Those ''Modded'' Or ''Hacked'' Pokemon Games. Sorry =/
There is no Pokemon called mew3.
There is no mew3
there is no such thing as mew3
there isn't even a mew3
To get Pokemon firered on PC download a vba and Pokemon firered ROM
You can catch a Ho-Oh at Navel Rock in Pokemon FireRed.
You can catch Moltres at Mt. Ember Peak in FireRed.
you can not catch him
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.
you can't catch any hoenn Pokemon in firered or leafgreen you must trade hoenn Pokemon from ruby or sapphire or emerald to leafgreen or firered.