The Pokémon Company International revealed some more information on Pokémon Sword & Shield today, and one bit of information is increased chances of encountering Gigantamax Snorlax in Max Raid Battles starting December 4, 2019 and lasting through early January, 2020.
Gigantamax Snorlax has an exclusive G-Max Move, G-Max Replenish, which does a lot of damage and also replenishes any berries that any of its allies have eaten during battle. This will replace any of Gigantamax Snorlax’s damaging Normal-type moves.
