You can't get Mew without hacking. Mew can't be caught in fire red.
Fuego IronworksUltimoz: I asked this question and by where can you find lots of fire Pokemon i ment where can you find lots of wildfire Pokemon!
you can find them in MT.Ember
You can't find it in Pokemon fire red
Heatran
anywhere
the only way to get a mew in Pokemon fire red is by hacking or downloading eon ticket at a real life Nintendo event.
in white two, you can find it in the desert resort
well you to get for Pokemon fire red.
you find them underground
As of the Generation VI games (Pokemon X and Y), no, there still are not any Pokemon with Water-Fire or Ice-Fire type combinations. There are a total of 42 possible type combinations, including these, that have not yet been assigned to a Pokemon. Update 2015: Ignore the confidence votes. Such a Pokemon is part of X and Y, but as of the original answer and even this update it is not yet officially released. It can only be found by hacking.
The first fire Pokemon in Gold is Cyndaquil and you find it in Prof. Elm's lab