It is also notable that Gigantamax Duraludon resembles another impressive modern structure: a skyscraper.

Source: https://screenrant.com/pokemon-scarlet-violet-teal-mask-indigo-disc-themes/

The first step is to obviously have a Duraludon in your party.

Source: https://www.digitaltrends.com/gaming/how-to-evolve-duraludon-pokemon-scarlet-and-violet-the-indigo-disk/

They are a new evolved form for Duraludon named Archaludon, as well as for Raikou and Cobalion named Raging Bolt and Iron Crown, respectively.

Source: https://gamerant.com/pokemon-scarlet-violet-dlc-new-pokemon-paradox-legendaries-raikou/