The Pokemon Legends: Arceus game honours past Pokemon games' core gameplay while infusing new action and RPG elements.

You'll need to catch, survey, and research wild Pokemon in a long-gone era of the Sinnoh region to create and complete the region's first Pokedex.
 
Catch Pokemon:

To catch Pokemon in the Pokemon Legends: Arceus game, you can observe them to learn their behavior, then carefully sneak up, aim your Poke Ball, and let fly.

You can also have your ally Pokemon battle wild Pokemon that you hope to catch. Just throw the Poke Ball holding your ally Pokemon near a wild Pokemon, and you'll seamlessly enter battle and command your Pokemon by choosing from moves it knows.
 
An Adventure in the Sinnoh of Days Gone By:

You'll be brought to the Sinnoh region, the setting for the Pokemon Diamond and Pokemon Pearl games. But this story unfolds in a long-gone era, before ideas such as being a Pokemon Trainer or having a Pokemon League even existed.

All around, you'll find Pokemon living wild in harsh environments that make for a Sinnoh unlike the region you may remember from the days of the Pokemon Diamond and Pokemon Pearl games.
 
Meet Your First Partner Pokemon:

As you start off on your adventure to create the region's first Pokedex, you'll be able to choose Rowlet, Cyndaquil, or Oshawott as a partner.

These three Pokemon arrived with a Pokemon Professor, who encountered them on research excursions to various regions.