From Game Spot:
Your overarching goal in New Pokemon Snap is to help Professor Mirror research the Illumina phenomenon, a mysterious occurrence causing certain Pokemon and plant life around the Lental region to inexplicably glow. As part of this research, you’ll need to travel about the region’s different islands and photograph the elusive Illumina Pokemon, which are the key to unraveling the mystery behind the phenomenon.
While most of the six Illumina Pokemon you need to photograph are fairly easy to find, the one located in the Lental Seafloor area, in particular, may give you some trouble, as it’s tied to a very specific interaction that you need to trigger using Illumina Orbs. This is the only instance in which you need to use these orbs to open a new pathway, but the game offers no clear in