Early purchasers of Pokemon Sun or Moon can receive a Munchlax that is holding a special item called Snorlium Z, which enables Snorlax to use an exclusive Z-Move called Pulverizing Pancake. The bonus Munchlax also knows the moves Hold Back and Happy Hour. Try them out for yourself in Pokemon Sun and Moon, which are available now for Nintendo 3DS.
Snorlium Z allows Snorlax to use its Pulverizing Pancake Z-Move in Pokemon Sun and Moon
Pokémon Blog 
There is something wrong!
I bought the Pokémon Sun game three days ago (Friday) and downloaded the Mustery gift Munchlax and Snorlium Z. Over a weekend of gaming I finally evolved my Munchlax into a Snorlax, however, I can’t get my Snorlax to hold the Snorlium Z crystal, it says it’s incompatible or when I select it is says “This Pokémon currently can’t use this crystal’s Z-Power. Is that OK?”
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Hi Steffi, hope you’re having a great time with the game so far! Does your Snorlax know the move Giga Impact? It’s the move that transforms into the Pulverizing Pancake Z-Move.
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Hi my son learned giga impact and then had the pulverizing pancake. He said he deleted it by mistake to obtain rollout. How can he get pulverizing pancake back? Please let me know. thanks
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Hello! He can visit the Pokemon Center in a place called Mount Lanakila, where a Move Tutor character can help Snorlax relearn the move Giga Impact.
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