You can't catch Mew in FireRed. You can only get it in a Nintendo event or from another trainer who has received a Mew from a Nintendo event.
Mew can be traded from Pokemon Emerald after obtaining the Old Sea Map and travelling to Faraway Island. None of the other Pokemon versions which are able to trade to FireRed have Mew as a possible Pokemon to capture of course you can also use an Action Replay or GameShark which can make Mew available in FireRed, but in-game wise there is only the option of trading.
Generation 3 Mew events are over however for Gen 4 and above you could get 999 Pokemon on My Pokemon Ranch and get your ranch to Level 25 and you will be able to get Mew if you trade a Pokemon Egg for it but you can only transfer it over to Diamond or Pearl for non-Japanese versions of My Pokemon Ranch. My Pokemon Ranch costs 1000 WiiPoints which equals to $10 and you can buy it from the Wii or Wii U's WiiWare section.
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
Nope, you have to trade him.
Pokemon firered emerald
The Cerulean Cave
can't but you can get one from emerald if you have the old sea chart and catch mew at faraway island.
No, you to migrate it from Pokemon firered/leaf green.
Mew is not in firered only emerald.
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 caan only send it from firered or leafgreen
Put it to sleep then use an ultra ball.
At faraway island by event or gameshark or a cheat without gameshark.
There no Mew in firered.
You can't catch it at Pokemon Pearl, you'll have to Transfer it from LeafGreen/FireRed or trade it with SoulSilver/HeartGold
You must capture Mew on Emerald and trade it to FireRed.
you get mew when you get mew to in the same cave
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.
its impossible without gameshark or action replay.
u cant unless u trade with Pokemon firered or leafgreen
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.
Mew 3 doesn't exist and the only Mew-anything you can find is mew2 at the back of Cerulean Cave.