The story starts with a scene where Steven is teaching you about battling with a Pokémon. When you finish learning, you are asked to choose one Pokémon from the three Sinnoh starters. Then, you will have to defeat Gym Leaders, collect Badges and so on until you met Team Hunter, a team that are lead by sixteen Trainers known as Chaos Sixteenth. They try to collect Plates from legendary Pokémon to summon the God of the Pokémon, Arceus...