Under normal circumstances, Mew is un-catchable during normal game play. If you did the Nintendo Events a few years back, you'd get an Aurora Ticket that would take you to Birth Island where you can catch Mew. Unfortunately, those events are long over. The only ways to get Mew now, is to either: Trade from someone who has one, or use a cheating device to automatically encounter Mew, or hack him into your party/box. Keep in mind, if you use cheats, Mew will not obey, regardless of badges earned. But at least you can get the Pokedex entry.
You can't get mew in firered or leafgreen.
Its not possible to get mew in firered only emerald can via Nintendo event.
You can't catch it on Firered you can only catch it in Emerald
No
Cerulean cave
Pokemon firered emerald
Nope, you have to trade him.
can't but you can get one from emerald if you have the old sea chart and catch mew at faraway island.
The Cerulean Cave
sadly,no
Unfortunately, Mew is not a catchable Pokemon in FireRed. It is impossible to catch it without a Cheating Device. Sorry, The interwebs fooled me, too.
No, you to migrate it from Pokemon firered/leaf green.