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Can't share my source, but they just sent me a picture of the Let's Go Dialga logo (which isn't finalized yet), along with some info about the game:
>Starters will be a small Dialga and Palkia with a BST of 480
>These forms will be exclusive to each version, and can't be deposited into Home, similar to stater Pikachu and Eevee from Let's Go Pikachu and Eevee
>The starters change forms after a specific point in the story (more below)
>You still play as Lucas or Dawn, and the rival is still Barry, but they're made in a super deformed style similar to LGPE
>Starter is met at Lake Verity, Barry gets the opposite one (so he gets Palkia if playing LG Dialga)
>The story is mostly unchanged, the player and Barry go to Spear Pillar where Cyrus uses the Red Chain to try to take control of Dialga and Palkia, making them power up to regular Dialga/Palkia
>Distortion World is in the game, but it's basically just a big platform with Giratina, no gravity puzzles
>Mesprit, Uxie, and Azelf will be repeatable legendaries like the Kanto birds in LGPE
>Azure Flute is in the game and will enable you to battle Arceus at Spear Pillar (it's a special battle, the catching part is still in Let's Go/Go style)
>When caught Arceus can create another small/starter Dialga/Palkia, it will be the same one as your starter