With every teaser for Pokemon Legends: Arceus, Game Freak is showcasing more new and returning Pokemon that are appearing in the highly anticipated pseudo-open world game. When the game arrives, players will explore the Sinnoh region in the distant past, back when it was called the Hisui region. Being so far in the past, Hisui may feature plenty of Pokemon that were not found in the Sinnoh region in Pokemon Diamond and Pearl. The geography may also vary in places - though the iconic Mt. Coronet is still a staple.