From the introduction:
The game is played in a world where many fantastic animals are able to be energized and stored nicely in a machine called a Poké Ball. These animals are called “pocket monsters,” or Pokémon for short, and they are carried as tools, friends and partners by Pokémon Trainers. Trainers have various skills and abilities each defined by a Train-er’s goal. There are Ace Trainers, who focus all of their energy into making their Pokémon the best fighters they can. Breeders, who raise Pokémon as if they are their own children and groom them up to be powerful. The Researcher gathers information and serves as a party’s go-to girl when they confront a creature they’ve never met. Rangers are nature guards who dedicate their life to the protection of a wild creature’s habitat while employing wilds in their feats. A Capture Specialist is a techie Trainer who can tweak equipment, including the Poké Ball to expand their collection. The Coordinator employs their Pokémon in Contests instead of battle as she shows off their beauty. Mystics use old magics to link themselves with Pokémon. Finally, the Psychic and Martial Artist get their hands dirty and fight the beasts with their own supernatural powers.
A Trainer may explore the world and battle at Gyms to gather Badges which allow them entrance to the Pokémon League Championships. They may compete in Contests to enter Grand Festivals. Maybe they’ll uncover a secret plot to destroy the world and try to stop those who would use Pokémon for evil. They may be breeding the most powerful Pokémon as their goal. No matter the destination, Pokémon will be valuable allies and tools in your journeys.