The Hidden Secret Of Indigo Park

Holly always found it odd that two important things in her life started with the word Indigo. The Indigo Disk, and Indigo Park. So, when she heads up to Crystal Pool with Rambley as she's giving him a tour of Kitikami, she sees the familiar fog surrounding the place, and Terapagos pops out of his Premier Ball, she expects to see Professor Turo again. What she doesn't expect to see is a very sickly Isaac Indigo approach the two of them, and then rip a page out of his diary, and give them one simple order.

"Find the rest."

But will they like what they find, and what do the Pokémon and people of Paldea, Kitakami, and Blueberry Academy have to do with it?