New Pokemon Snap: 100% | Part 7:

New Pokémon Snap (Japanese: New ポケモンスナップ New Pokémon Snap) is a spin-off Pokémon game for the Nintendo Switch. It is a sequel to the original Pokémon Snap for the Nintendo 64.
At the start of the game, the player is invited by Professor Mirror and Rita to the Laboratory of Ecology and Natural Sciences in the Lental region to conduct a survey of the Illumina phenomenon that has been recorded in a travelogue written by Captain Vince. The player first takes pictures of Pokémon in the Florio Nature Park. Later, the professor allows the player to take pictures in the nature park at night and the player unlocks the scan function. At the end of the nature park, Professor Mirror senses an incredibly strong energy reading, and asks the player to research it for him. After that, the player returns to the park to discover the first Illumina Pokémon spotted in 100 years, Meganium.

Professor Mirror is thrilled after seeing Meganium, and he requests the player take pictures of the three other Illumina Pokémon in the travelogue. The player later unlocks the function to use fluffruit. Todd Snap and Phil later arrive at the laboratory, and Phil treats the player as his rival. The player then visits Founja Jungle. After taking pictures of glowing crystablooms at Florio Island and Belusylva Island, Professor Mirror creates Illumina orbs, which can cause Pokémon to temporarily be in the Illumina state.

The player can then choose to visit the Maricopia Islands or Voluca Island. During this period, the player unlocks Blushing Beach, Maricopia Reef, Lental Seafloor, Sweltering Sands, Fireflow Volcano, and Elsewhere Forest. The player also obtains Illumina orbs for use on the other islands, and pictures of the other three Illumina Pokémon, Wishiwashi, Milotic, and Volcarona. After this, Professor Mirror finds an energy reading at Durice Island, an island not mentioned in the travelogue. After taking pictures of the Pokémon in Shiver Snowfields, the player unlocks Outaway Cave, which is the source of that energy reading. After taking pictures of the Illumina Steelix found in the area, a mural depicting the five Illumina Pokémon is found.

According to rumors, the Illumina Pokémon once protected Lental from the Tellur Meteorite, but Professor Mirror thinks that the Illumina phenomenon was caused by the meteorite hitting Lental. After exploring the ruins of a small island known as Aurus Island, the player finds the last Illumina Pokémon, Xerneas, which appears to be the source of the phenomenon. After capturing pictures of it, Xerneas goes back to sleep. Later, the Professor wonders who created the ruins and murals in Aurus Island, and why the player was able to meet Illumina Pokémon. Rita, Phil, and Todd later explain that those Pokémon apparently sensed the player's love for Pokémon, which caused them to appear in front of the player.
How to unlock
Unless otherwise noted, all night variants of stages are unlocked when the day variant is at Research Level 2.
Park (Day): From the start of the game.
Florio Island Illumina Spot: Play Park (Night) for the first time.
Research Camp: The first route is unlocked after the player takes pictures of two Illumina Pokémon, and the second route is unlocked by taking three pictures instead.
Side Path (Day): Update to Version 2.0.0, and unlock Beach (Day) and Sands (Day). After that, the side path can be unlocked by scanning a tree in Florio Nature Park.
Side Path (Night): Play Side Path (Day) for the first time.
Jungle (Day): Complete the Florio Island Illumina Spot.
Forest: Raise Volcano to Level 2.
Belusylva Island Illumina Spot: Play Elsewhere Forest for the first time.
River (Day): Update to Version 2.0.0, and complete the game.
Beach (Day): Raise Jungle (Day) and Jungle (Night) to Level 2.
Beach (Night): Raise Snowfields (Night) to Level 2.
Reef (Day): Raise Beach (Day) to Level 2.
Reef (Evening): Complete the game.
Undersea: Raise Reef (Day) to Level 2.
Maricopia Islands Illumina Spot: Raise Undersea to Level 2 or 3. In Level 2, the player must throw illumina orbs on a Clawitzer to cause it to destroy a rock. In Level 3, the path is automatically unlocked.
Sands (Day): Raise Jungle (Day) and Jungle (Night) to Level 2.
Volcano: Raise Sands (Night) to Level 2.
Voluca Island Illumina Spot: Raise Fireflow Volcano to Level 2.
Badlands (Day): Update to Version 2.0.0, and complete the game.
Snowfields (Day): Take pictures of four Illumina Pokémon.
Cave: Raise Snowfields (Night) to Level 2.
Durice Island Illumina Spot: Raise Outaway Cave to Level 2.
Ruins: Complete Durice Island Illumina Spot.
Aurus Island Illumina Spot: Light up the six crystablooms at the end of the ruins