It evolves via happiness
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It evovles with max happiness
You need to get it's friendship to full.
Munchlax evolves into Snorlax via max happiness in Pok
You level him up on a high friendship level, I suggest the "sooth Bell" found in the Pokemon Mansoin second room to the left.
To evolve the Munchlax you just have to level it up when its holding the leftovers.