A budding Pokémon photographer travels to the lush and varied Lental region, invited by the esteemed Professor Mirror and his assistant Rita to join their ecological research. Working from the Laboratory of Ecological and Natural Sciences, the player is sent out across the region's islands to observe and photograph Pokémon thriving in their natural habitats, from jungles and deserts to reefs and caves. But the survey has a deeper purpose. The professor is investigating the mysterious Illumina phenomenon, a strange, glowing radiance that certain Pokémon and rare flowers exhibit, a wonder last documented in an explorer's travelogue a full century ago. Venturing through each island by day and night, the photographer sets out to capture these elusive creatures on film and help unravel the long-forgotten secret behind the luminous phenomenon.