Pokemon Scarlet and Pokemon Violet Legendary Pokemon are very different from what we’re used to in Pokemon games in more ways than one. For starters: they transform and you can ride them, but they’ll also be a big part of the game, and it looks like you’ll be capturing one very early on in your adventure.
Both Koraidon and Miraidon can change form depending on the environment you travel to. On land, they can be driven like a motorcycle and climb steep mountains with ease. Hopefully, they don’t fall like the Hisuian Sneales seen in Pokémon Legends: Arceus. Your Legendary Pokemon can also take to water and air, making it the only one to take down all traveling Pokemon.
Here are all their forms, as laid out on the official Pokemon website.