Like every single chapter apart of Detective Pikachu, you will be able to activate a variety of different Pika Prompts during the fourth 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 13 Different Pika Prompts during the fourth chapter of the game. Below is a list of all said Pika Prompts, along with the requirements for each.
Accelgor And The Donut (Baker Detective Agency): Be Near Accelgor
Ludicolo's Dance Moves (Hi Hat Cafe): Be Near Ludicolo
Seasick (Cappucci Island): No Special Requirement
Lovely Locale (Cappucci Island): No Special Requirement
Flight Of The Wingull (Cappucci Island): Be Near Wingull
Louise's Scent (Cappucci Island): Be Near Spritzee
Scent Of A Potion (Cappucci Island): Be In Waal's House
Manetric Stare Down (Cappucci Island): Be Near Manetric
Tropius' Fruit (Cappucci Island): Be Near Tropius
Sticky Shellos (Cappucci Island): Be Near Shellos
Grown Up Problems (Cappucci Island): After Brad Makes Case Deductions
Manetric And The Flying Disc (Cappucci Island): Be Near Manetric When Solving Case