I thought of a Toxic Stall set for Dewgong while I was making a Shoddy Battle team. Here it is:
Item: Life Orb
Nature: Naive
Evs: 252Def/252SpAtk/4Hp
Moves: Ice Beam
Substitute
Toxic
Waterfall
How to use: Kinda like a Toxic Stall set. First, sub up and then use Toxic. Then, stall out your opponent with Ice Beam and Waterfall. If your sub breaks, you know what to do.