The title is pretty self explanatory.
Actually, you can. These are the steps - 1. Breed it with a Primarina that knows Sparkling Aria or and Freeze Dry. 2. Put the Gigantimax Lapras in the Nursery with 2 open moveslots, then put an offspring with Sparkling Aria and Freeze Dry and the moves will transfer over. Alternatively, you could just breed a Lapras with those moves and give it a Max Soup. Source: https://gamefaqs.gamespot.com/boards/259372-pokemon-sword/78460857 Just watch, I am going to be sniped.