In Light Platinum Pocket, you start in Yellow Town, a nice spring day. The professor wants you to go to Central City to investigate an ancient engraved with Kaohri, the Zhery League Champion. Things go wrong when they discover that a Team Steam soldier was spying them. You fight against the soldier, but he runs away to tell our discovery to the dangerous Team Steam. The hero returns to the lab to tell the discovery to Professor Jasmine: the origin of the legendary Pokémon and Arceus. Then, you noticed that a very important secret, kept over thousands of years, is now in the wrong hands