You can catch a munchlax but you have to trade 2 Snorlaxes or a Snorlax and a Ditto from FireRed or LeafGreen and breed them.
They haven't come out with AR or GS codes for it yet it hasn't even came out everywhere yet.
Co-leader of Team Shiny Zapdos
I'm also a Leader of Team Hyper Wire
Leader of Team Sirens
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Vote For Pedro!!!!!!!!!!!!!!!!!Vote For Pedro!!!!!!!!!!!!!!!!!Vote For Pedro!!!!!!!!!!!!!!!!
Vote For Pedro!!!!!!!!!!!!