Get it from honey trees
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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.
There is no person who will trade a Munchlax in Soul Silver. You have to breed a Snorlax with a Full Insense if you want a Munchlax.
you cant munchlax is knew on the Pokemon diamond and pearl national dex.
your rival has a munchlax when u vs Jupiter and mars in spear pillar
put ditto in the daycare with a sornlax with a full increase and wait for a while and then you will get an egg that will hatch into munchlax