The new legendary Pokémon available in the Pokémon Sword and Shield DLC expansion, The Isle of Armor, is Kubfu. It’s the starting form and will evolve into Urshifu, which you can make into a Fighting and Water-type or a Fighting and Dark-type depending on what choice you make in the game. After you make your decision and progress through the available towers and evolve Kubfu, you can unlock Urshifu’s Gigantamax form.
You will have the opportunity to do this after you complete the final battle on The Isle of Armor at the top of your chosen tower, where you defeat Dojo Master Mustard. At this point, Kubfu will have evolved into Urshifu. You need to return to the Master Dojo, and Hop will show up, informing you he’s on the Isle of Armor to discover more about Dynamaxing Pokémon. You and Hop will have to complete the next step to have Urshifu unlock its Gigantamax form, which requires you to obtain honey to add to the Max Soup.
Go to Forest of Focus on the Isle of Armor at any of the entrances to meet up with Hop. You will enter a cutscene speaking to Hop about finding a Petilil, and it evolves into a Lilligant, the Pokémon you have been searching for. You need to find the Pokémon’s parents. You don’t have to venture too far. You can search the surrounding area to find a Lilligant and then bring it back to where Hop and the Petilil are waiting for you.
After you receive the honey from those Pokémon, you need to get it from Applin. Follow the path in the same forest, and you find an Applin in the middle of the pathway, which brings you to another cutscene. You and Hop will have scared it into a tree. When you bring it down, it hits you on your head, but you get the Pokémon’s honey.
The next stop is an island next to the giant Water tower on Challenge Beach. Race over there, and when you arrive at Challenge Beach, you can ride your Rotom Bike to the Honeycalm Island. You will find Hop at the center of it. The Pokémon you are after on this island is a Vespiquen. When you attempt to drive one from the tree at the center of the island, you aggravate it. Now, you have to fight a Dynamax Vespiquen, a Bug, and Flying-type. You will receive Max Honey after the battle.
Bring it all back to the Master Dojo, and you can now give it to Urshifu’s Max Soup. However, you will still need Max Mushrooms to receive the soup. You can obtain Max Mushrooms by completing max raids around the Isle of Armor.