That item doesn't exist in leafgreen their is a sea incense and lax incense in the cave.
It's in the lost cave
To get a full stomach incense in Pokémon Fire Red you must first talk to every single fat, male NPC in the game. After you have done this talk to Professor Oak.
On island one, there is a cave with a ruby and a full set of braille alphabet.
It is in the Lower Cave of Mt. Mortar. You will need Rock Climb to get it.Inside Mt. Mortar
you can't
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).
No.
The Pokemon Rock is just to look at; there is no cave inside it.
In Veilstone city; theres a wall you rock climb on.use and get the item in the pokeball, which is full incense.
go to veilstone city and use rock climb on a wall and grab the poke'ball and that is the full incense.
Nowhere
it will let you breed munchlax's without the full incence you will get snorlax