Like every single chapter apart of Detective Pikachu, you will be able to activate a variety of different Pika Prompts during the third chapter of the game. Some of these Pika Prompts have certain location requirements found in this chapter, while some you can activate by doing nothing special at all. In total, you can obtain 18 Different Pika Prompts during the third chapter of the game. Below is a list of all said Pika Prompts, along with the requirements for each.
What's Your Name (PCL): Talk To Pikachu Outside The PCL
A Troubled Pikachu (PCL): Talk To Pikachu Outside The PCL
Fridge's Room (PCL): Be In Fridge's Room
Garbodor's Stench (PCL): Be In Fridge's Room
The Garbodor Machine (PCL): Be Near Garbodor Machine
Intensely Spciy Cake (PCL): No Special Requirement
Sour Cake (PCL): No Special Requirement
Looking For The Vial (PCL): Be In Hallway
Pikachu Came Running Out! (PCL): Be In Courtyard
Fennekin's Favorite Food (PCL): Be Near Fennekin
Shuckle's Observations (PCL): Be Near Shuckle
Looking For The Key (PCL): Be Near Klefki
Wallace's Room (PCL): Be In Wallace's Room
A Glance From Minccino (PCL): Be In Dorothy's Office
No Need To Stick Around (PCL): Be In Courtyard After Trevenant Goes Berserk
Sad Creatures (PCL): Be In Courtyard After Trevenant Goes Berserk
A Cold Room (PCL): Be In Library
How To Catch Gengar (PCL): Figure Out How Gengar Is Involved