you cant he is a 4th gen Pokemon and its a 3rd gen game
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Go to the GTS and if you have Munchlax in your Pokedex, send in a Pokemon and ask for a Munchlax.
First off, Munchlax is a 4th Generation Pokemon and is thus not available in Pokemon FireRed or LeafGreen. Make sure you are playing Pokemon Diamond, Pearl, Platinum, HeartGold, or SoulSilver. The Snorlax must then be holding a Full Incense in the Day Care in order to produce a Munchlax egg. Full Incense can be found in Veilstone City (in D/P).
you cant munchlax is knew on the Pokemon diamond and pearl national dex.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
Meoth, Munchlax