Like every single chapter apart of Detective Pikachu, you will be able to activate a variety of different Pika Prompts during the second 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 7 Different Pika Prompts during the second chapter of the game. Below is a list of all said Pika Prompts, along with the requirements for each.
Case Documents (Harry's Apartment): No Special Requirements
How Far To The Exit? (Litwick Cave): Be Under Hole In Ceiling
Drifting Drifloon (Litwick Cave): Be Near Drifloon
The Place Where The Wind Blows (Litwick Cave): Help Glalie
The Water In The Cave (Litwick Cave): Be Near The River
Echoes (Litwick Cave): Freeze River & Stand On Ice
Careless On The Ice (Litwick Cave): Freeze River & Stand On Ice