Something odd is going on. There are strange signals coming from all over the Sevii Islands. Pokemon inhabiting that region are spontaneously turning evil. The Pokemon are usually peaceful, but now they have been destroying the environment. The source of the signal seems to be a warehouse complex on southern Five Island. A group of junior detectives, who are also expert Pokemon Trainers, have been sent from the Goldenrod City Detective Agency to investigate the problem, and eliminate it.
The agents are waiting in a field for the chopper to take them to Five island.