Actually, it is from friendship when it evolves
or you make it eat all the berries that make it friendly until it can not eat any more then level it up
mine has max freind but not evolve
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To evolve the Munchlax you just have to level it up when its holding the leftovers.
Snorlax does not evolve. However, he does evolve from Munchlax. There is no specific level that Munchlax evolves. If he levels up with a high happiness rating, he will evolve into Snorlax.
It does not evolve at a certain level, it evolves through happiness.
It evolves via happiness
You need to get it's friendship to full.