Many Legendary Pokémon returned in the Pokémon Scarlet and Violet DLC, and players discovered something unique about two of them in particular.
10 Secrets and Easter Eggs in the Indigo Disc – Pokémon Scarlet and Violet DLC
Thanks to The Indigo Disk DLC, 25 returning Legendary Pokémon have been added to the Gen IX Pokémon games for you to track down and catch. With the help of an old man named Snacksworth, you can get your hands on everything from a Rayquaza to an Entei without having to transfer them over from another game, which is pretty darn convenient, if you ask me.
Most of these Legendary Pokémon are pretty standard, but two are a little out of the ordinary. As pointed out by players in a Reddit thread from July 21, Groudon and Lugia are the only returning Legendaries that come with Tera Types that don’t match their original type. You do have the ability to change their Tera Types to whatever you want using Tera Shards, but it was undoubtedly an intentional decision on Game Freak’s part to give Groudon the Fire Tera Type and Lugia the Water Tera Type. And it has to do with previous content and lore in the franchise.
Groudon's Fire Tera Type is a clear reference to its Primal form, which debuted in Omega Ruby and Alpha Sapphire. While Groudon's natural type is purely Ground, Primal Groudon has a Ground/Fire dual-type. Additionally, the Gen III Legendary's ability allows the sun to power Fire-type moves, regardless of whether it's in its normal or Primal form.