Yep, you're right. It takes some of the pressure off set up. As long as you have a single Empoleon you can hit for 80-110 with Miltank, meaning that that one Empoleon can use Diving Draw to set up other Empoleons/Dusknoir/keep up the stream of Miltanks. Later on, Dusknoir kind of forces the opponent to Bench more even if they don't want to, because multiple KOs are threaten a loss via Benching. Empoleon comes into its own then.