It's in the lost cave
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go to veilstone city and use rock climb on a wall and grab the poke'ball and that is the full incense.
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).
it will let you breed munchlax's without the full incence you will get snorlax
If you breed a Wobbuffet(holding lax incense) with a respected Partner and it should make a Wynaut not Whynut.
Give it a full incense and breed it to get a Munchlax egg.