You should talk to people who have already pitched to that investor.
Pitching to investors is a personal thing, it’s a human to a human. So, you need to understand “what does that other person, what is that investor really interested in?”
Some investors are really interested in certain segments or certain stages of a company, or they’re going to delve into certain aspects of a business more than they’re going to delve into others.
Ask people who have pitched to that investor before and understand exactly what a pitch felt like and where the questions came from. That’ll help you prepare in anything that may come your way.