Pokémon Presents showcases ambitious changes to the formula in ‘Pokémon Legends Arceus’

Yes, in an unexpected twist, the stream revealed that “Arceus” would actually be introducing new Pokémon to the Pokedex, something that’s never been done outside a mainline game before. Pokémon like Hisuian Growlithe and Hisuian Braviary, alternate forms of existing Pokémon, appear alongside new evolutions like Wyrdeer, an evolution of Stantler, and Basculegion, an evolution of Basculin.

Source: WP