Mew two sould be at the end of the cave in cerulean city after you beat the elite 4.
Mewtwo, yes, if you have a FireRed or LeafGreen with Mewtwo.
You can't get mew in firered or leafgreen.
sadly,no
The Cerulean Cave
There no Mew in firered.
You must capture Mew on Emerald and trade it to FireRed.
Capture Entei/Raikou/Suicune.
how did u get mew
mew
no
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.
Its not possible to get mew in firered only emerald can via Nintendo event.