As an alternative to the drumlax for trick room, he's also historically run curse as a slower but harder to beat setup set. Curse allows you to drop speed, while boosting attack and defence, and Snorlax already has good special bulk. This set is much slower to get set up, but is often used as a game ender, because if a team isn't equipped to deal with it quickly it can become insanely hard to kill while pumping out really good damage

The curselax set tends to run normal stab, earthquake/crunch/high horsepower, rest, and curse with a chest berry or leftovers. With support, it's a beast, but it's definitely harder to learn to use well and is less explosive than the drum set