Pokemon Legends: Arceus takes place in the Sinnoh ... As you might expect, that means the two legendary Pokemon from those games, Dialga and Palkia, appear in this game as well.

If you go with Adaman, the Diamond Clan leader, you’ll catch Dialga and fight against Palkia. If you go with Irida, the Pearl Clan leader, you’ll catch Palkia and fight against Dialga.

The Legendary dragons of the Sinnoh region may be getting new forms in Pokemon Legends Arceus ... is what is allegedly in store for Dialga and Palkia. According to recent leaks on Twitter ...

To see Palkia in Brilliant Diamond ... Town after beating Cyrus at Spear Pillar and she’ll show you a picture of Dialga which will add it to your Pokedex.